Android Studio: /dev/kvm device permission denied

Question

When I try to run my Android app on an emulator I get this error:

/dev/kvm permission denied.

I checked the permissions and added the user I am currently logged in with to the kvm group. What is wrong?

Followed this approach and it worked, sudo chown /dev/kvm (This was on Ubuntu 18.04.4 LTS) — Hari Palappetty, Jul 20 '20 at 05:14

serv-inc · Answer 1 · 2020-04-22T08:21:14.663

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As mentioned in the comments, starting with Ubuntu 18.04 and Linux Mint Tara you need to first sudo apt install qemu-kvm.

To check the ownership of /dev/kvm use

ls -al /dev/kvm

The user was root, the group kvm. To check which users are in the kvm group, use

grep kvm /etc/group

This returned

kvm:x:some_number:

on my system: as there is nothing rightwards of the final :, there are no users in the kvm group.

To add your user to the kvm group, you could use

sudo adduser $USER kvm

which adds the user to the group, and check once again with grep kvm /etc/group.

As mentioned by @marcolz, the command newgrp kvm should change the group membership live for you. If that did not work, @Knossos mentioned that you might want to log out and back in (or restart), for the permissions to take effect. Or do as @nmirceac mentioned and re-login in the same shell via su - $USER.

edited Apr 22 '20 at 08:21

answered Aug 18 '17 at 05:18

serv-inc

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After install `qemu-kvm` and add my user to the group `kvm` it did not work. But it did after **restart** computer (Ubuntu 18.04). – sdlins May 13 '18 at 23:15
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@rupj does the trick however google has just released a patch for linux version that also fixes libstd++ issues. – naveen.panwar May 16 '18 at 09:52
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What if the user was `root` and the group was `root`. Should we change its group? – Michael Fulton Jun 07 '18 at 21:54
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I had to everytime i turned on my pc sudo chown -R username:username /dev/kvm These steps saved my headache of everytime. Thansk @serv-inc This should be accepted as correct answer. – Sajid Zeb Aug 04 '18 at 05:59
@slinstj Logging off and on again should be sufficient. – yasd Aug 04 '18 at 19:32
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You can use this command to automatically add current user to kvm `sudo adduser $USER kvm` – Munish Chandel Aug 13 '18 at 02:19
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@MichaelFulton: in that case, `sudo apt install qemu-kvm` should add the `kvm` group (edit) – serv-inc Sep 04 '18 at 14:59
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@MichaelFulton I changed the user and group to my username. Then added my username to the group. Works. – Paamand Nov 27 '18 at 23:51
You might need to log out and back in AND restart Android Studio to see the change, for me, the 'refresh' button in the AVD manager didn't seem to refresh the permissions – Gaboik1 Dec 24 '18 at 04:16
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I needed grant ownership of kvm to user too: `sudo chown $USER /dev/kvm ` – Iván Rodríguez Torres Mar 08 '19 at 10:47
I don't know but this command worked for me to add user to the kvm usergroup: sudo usermod -a -G kvm seocliff – muhammad tayyab Apr 03 '19 at 06:02
@sdlins to just logout and back in does the job too. – phrogg Jun 21 '19 at 22:10
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if you don't want to logout or restar, simply do sudo chown $USER /dev/kvm as described by @IvánRodríguezTorres – Carlos Garcia Aug 01 '19 at 09:33
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If you don't want to log out, use `newgrp kvm` as that will check your group membership like if you were logging in. – marcolz Sep 04 '19 at 10:28
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For updating an existing user, it is probably best to use `usermod -aG kvm $USER` Also in my case (Ubuntu 18.04) I had to add the kvm group first. – Ricky Hewitt Oct 22 '19 at 00:35
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don't chown it - most orthodox way is to refresh the groups - "su - $USER" as the user - and then check everything with the command `id` – nmirceac Mar 27 '20 at 07:58
@sdlins A reboot/logout isn't strictly necessary. You can also do `su - $USER`, which refreshes the group assignment in that particular shell (i.e., you'll have to launch Android Studio from that shell). – bluenote10 Aug 01 '21 at 11:02
Works with me only need to reboot. – Memo May 09 '23 at 17:59

score 644 · Answer 2 · edited Jan 04 '19 at 19:00

644

This is how I got it to work in Ubuntu 18.04

sudo apt install qemu-kvm

Add your user to kvm group using:

sudo adduser <Replace with username> kvm

If still showing permission denied:

sudo chown <Replace with username> /dev/kvm

Try it.

edited Jan 04 '19 at 19:00

Gabor

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answered Jun 23 '18 at 17:23

Jerin A Mathews

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Thanks! This worked for me too. I didn't have to perform the last step because my permissions were set to: `crw-rw---- 1 root kvm 10, 232 Jul 27 15:32 /dev/kvm` (so once I added my user to the kvm group, it just worked). – Andy Turfer Jul 27 '18 at 14:36
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step 2 might require a reboot – Jakob Eriksson Aug 29 '18 at 09:48
Do I need to reboot OS? – Nikolay Baranenko Sep 11 '18 at 17:12
Worked on Ubuntu 18.04.1! @NikolayBaranenko is not necessary – JCAguilera Sep 28 '18 at 13:30
this helped me in ubuntu 18.04 – Gulnaz Ghanchi Dec 21 '18 at 07:23
Worked for me on Mint 19.1 after reboot – Roman Feb 17 '19 at 08:11
It works like charm, especially the last command you mentioned. I did not even need to restart IDE or OS. – Shamsul Arefin Mar 07 '19 at 07:50
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you should not change the ownership of `/dev/kvm/` folder. instead you should add the user to `kvm` group as in this answer: https://stackoverflow.com/a/45749003/1213934 – logoff Apr 10 '19 at 10:23
this worked for me on ubuntu 18.04 I had to do all the steps,I rebooted android studio after step 2 – Mahesh Jamdade Jul 22 '19 at 10:43
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Thanks. Worked for me on Ubuntu 18.04 – Nikhil Aug 07 '19 at 16:11
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@JakobEriksson It requires one to re-login. Reboots are reserved for Windows (and systemd updates) ;-) – Bayou Sep 04 '19 at 10:40
If I close my device and try to restart it, it wont work unless I do `sudo chown /dev/kvm` again – Aseem Nov 20 '19 at 02:35
It worked with Linux Mint 19 Tricia, XFCE, without a reboot – Denny Jan 13 '20 at 17:07
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Yes just as @logoff has suggested, you shouldn't change the ownership of /dev/kvm, because doing that you break the Default ACL of your Linux system, which is not a good security practice. Follow this instruction instead: https://stackoverflow.com/a/45749003/7206497 – eVagabond Jan 16 '20 at 15:53
How would one adapt this solution outside of Ubuntu 18.04? I don't even have the qemu-kvm package on Elementary OS, which is based on Ubuntu. I think it's better not to install an additional package. – icedwater Mar 07 '21 at 15:27
It worked for me just need to restart the system after instructions – Er. Mohit Agrawal Oct 07 '21 at 14:30

score 51 · Answer 3 · edited Aug 10 '20 at 14:20

51

Try this, it worked for me:

sudo apt install qemu-kvm
sudo chown -R <username>:<username> /dev/kvm

edited Aug 10 '20 at 14:20

Brian61354270

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answered May 21 '18 at 17:08

Milan

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You might need to relogin for it to take effect. – Vadim Peretokin Dec 22 '18 at 16:40
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This is questionable, since it treats a multiuser system as a single user system. No other user will be able to use KVM when following this approach. Is that a good idea? I doubt it... – arkascha Aug 24 '19 at 10:47
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This solution is plain wrong as it modifies the default rights to /dev/kvm. It's not just that it will not persist between reboots / system updates. It also forcefully modifies system settings. Stay away. – andrzejwp Mar 31 '20 at 16:24
Don't do the `chown` - add your username to the proper groups - kvm or libvirt. See the documentation for [https://help.ubuntu.com/community/KVM/Installation](Ubuntu). – Daisuke Aramaki Apr 29 '20 at 14:00
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Why do you chown a device file recursively? Also, what's with the `–` suffix? This surely yields an error. – maxschlepzig May 24 '20 at 10:18

Shalauddin Ahamad Shuza · Answer 4 · 2019-01-17T06:18:12.343

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This is because /dev/kvm is not accessible. To make is accessible from android studio run the below command

sudo chmod 777 -R /dev/kvm

It will ask for your password. After that restart Android Studio.

KVM is required to rum emulator. If you have not install it yet then install it

sudo apt install qemu-kvm

edited Jan 17 '19 at 06:18

answered Jan 15 '19 at 08:48

Shalauddin Ahamad Shuza

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This answer did the trick in my case after following the most upvoted answer! Thanks! – Crono Feb 13 '19 at 18:53
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Do not do that. See my answer above. – andrzejwp Mar 31 '20 at 16:14
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@andrzejwp: What answer? I don't see any answer from you. Given how adamant you are about your answer, can you **link to it**? – Dan Dascalescu Apr 22 '20 at 05:19
Why do you recursively (`-R`) change the permissions on a single device file? Also, the execute permissions are superfluous. Finally, udev may adjust the permissions after each emulator start. – maxschlepzig May 24 '20 at 10:20

score 32 · Answer 5 · edited Jul 14 '18 at 22:00

32

Have you also tried following, it should work:

sudo chown <username> /dev/kvm
sudo chmod o+x /dev/kvm

edited Jul 14 '18 at 22:00

Amit Verma

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answered Jul 14 '18 at 18:37

nobjta_9x_tq

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`chmod o+x` is completely useless. The first command make it work - but see my other comments way down why this is a bad idea. – Gerd Nov 01 '19 at 12:51
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This works but does not persist a reboot. I am on POP OS though! – Arka Prava Basu Feb 19 '20 at 06:04
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This solution is plaing wrong as it modifies the default rights to `/dev/kvm`. It's not just that it will not persist between reboots / system updates. It also forcefuly modifies system settings. Stay away. – andrzejwp Mar 31 '20 at 16:13
This is not persistent over reboots. The udev daemon might re-adjust the permissions during its runtime and given others the executable permission bit is simply superfluous. – maxschlepzig May 24 '20 at 10:44

score 30 · Answer 6 · edited Jun 20 '20 at 09:12

30

sudo chown $USER /dev/kvm

Simply running that one command worked for me here in September 2019 running:

Description: Ubuntu 18.04.3

LTS Release: 18.04

Codename: bionic

edited Jun 20 '20 at 09:12

Community

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answered Sep 14 '19 at 16:55

raddevus

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Do not do that. See my answer above. – andrzejwp Mar 31 '20 at 16:14
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@andrzejwp Where is your answer? Is it in a comment? If it is, it is probably collapsed and I can't see it. I've searched the page for your user tag, but can't find. I am happy to try your answer out -- because my answer isn't quite right (doesn't persist) -- but I cannot find it. Leave a link or create a new answer and I'll try it. – raddevus Mar 31 '20 at 17:51
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@andrzejwp: please link to your answers, instead of saying "above". What if your answer ends up below the one you're commenting on? – Dan Dascalescu Apr 22 '20 at 05:16
This is not persistent over reboots and the udev daemon may readjust the ownership of `/dev/kvm` during its runtime. – maxschlepzig May 24 '20 at 10:45

score 29 · Answer 7 · answered Oct 14 '20 at 18:10

29

Step 1: (Install qemu-kvm)

sudo apt install qemu-kvm

Step 2: (Add your user to kvm group using)

sudo adduser username kvm

Step 3: (If still showing permission denied)

sudo chown username /dev/kvm

Final step:

ls -al /dev/kvm

answered Oct 14 '20 at 18:10

Jewel Rana

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[Duplicate](https://stackoverflow.com/a/51003471/427158) of [several](https://stackoverflow.com/a/61345425/427158) [answers](https://stackoverflow.com/a/61767283/427158). – maxschlepzig May 18 '23 at 11:18

maxschlepzig · Answer 8 · 2020-08-20T19:48:44.673

Under Ubuntu, the permissions of /dev/kvm usually look like this:

$ ls -l /dev/kvm
crw-rw---- 1 root kvm 10, 232 May 24 09:54 /dev/kvm

The user that runs the Android emulator (i.e. your user) needs to get access to this device.

Thus, there are basically 2 ways how to get access:

Make sure that your user is part of the kvm group (requires a re-login of your user after the change)
Widen the permissions of that device such that your user has access (requires a change to the udev daemon configuration)

Add User to KVM Group

Check if your user is already part of the kvm group, e.g.:

$ id 
uid=1000(juser) gid=1000(juser) groups=1000(juser),10(wheel)

If it isn't then add it with e.g.:

$ sudo usermod --append --groups kvm juser

After that change you have to logout and login again to make the group change effective (check again with id).

Widen Permissions

Alternatively, you can just can widen the permissions of the /dev/kvm device.

Example:

echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' \
    | sudo tee /etc/udev/rules.d/99-kvm4all.rules
sudo udevadm control --reload-rules
sudo udevadm trigger --name-match=kvm

FWIW, this is the default on other distributions such as Fedora and CentOS.

Check the effectiveness of the above commands with another ls. You should see output similar to:

$ ls -l /dev/kvm
crw-rw-rw-. 1 root kvm 10, 232 2020-05-16 09:19 /dev/kvm

Big advantage: You don't need to logout and login again for this change to be effective.

Non-Solutions

calling chmod and chown directly on /dev/kvm - 1) these changes aren't persistent over reboots and 2) since /dev/kvm permissions are controlled by the udev daemon, it can 'fix' its permissions at any time, e.g. after each emulator run
adding executable permissions to /dev/kvm - your emulator just requires read and write permissions
changing permissions recursively on /dev/kvm - I don't know what's up with that - looks like cargo cult
installing extra packages like qemu - you already have your emulator installed - you just need to get access to the /dev/kvm device

An amazing solution, not only it does *not* require relogin, but also explains why most other solutions have unneeded steps or are plain flawed. +1! — MestreLion, Sep 23 '20 at 14:57
Thank you. It worked, and you also explained WHY and HOW it works. — Radim Cernej, Apr 14 '22 at 09:03

score 24 · Answer 9 · answered Oct 21 '19 at 03:00

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I am using ubuntu 18.04. I was facing the same problem. I run this piece of command in terminal and problem is resolved.

sudo chown $USER /dev/kvm

the above command is for all the user present in your system.

If you want to give access to only a specific user then run this command

sudo chown UserNameHere /dev/kvm

answered Oct 21 '19 at 03:00

ujjal das

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No. This is not something you should do. See my answer above. – andrzejwp Mar 31 '20 at 16:14
How is this answer different from @raddevus' [answer](https://stackoverflow.com/a/57937547/427158) which he posted one month earlier? – maxschlepzig May 24 '20 at 10:47

Nasir Jafarzadeh · Answer 10 · 2020-09-29T11:50:35.393

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Here is a simple solution

open the terminal and run the following commands

sudo groupadd -r kvm

sudo gedit /lib/udev/rules.d/60-qemu-system-common.rules

Add the following line to the opened file and save it

KERNEL=="kvm", GROUP="kvm", MODE="0660"

Finally run:

sudo usermod -a -G kvm <your_username>

Reboot your PC and Done!

edited Sep 29 '20 at 11:50

answered Nov 07 '19 at 08:37

Nasir Jafarzadeh

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This is bad advice. Never directly edit udev configuration under `/lib/udev/rules.d`. Udev has an overlay mechanism where configuration placed in `/etc/udev/rules.d` has priority over one available under `/lib/udev/rules.d`. – maxschlepzig May 24 '20 at 10:50
I'm not a professional Linux user, It's just a solution that worked for me and I decide to make it succinct and easy to read for others like me. thank you for your clarification, Max. – Nasir Jafarzadeh May 26 '20 at 08:38
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@NasirJafarzadeh: so why not edit your answer to create that override at `/etc/udev/rules.d` instead of editing `/lib/udev/rules.d`? That's what Gerd suggests, by the way. – MestreLion Sep 23 '20 at 13:49

Gerd · Answer 11 · 2019-11-01T12:25:42.840

There's absolutely no need to install qemu-kvm (and all its dependencies) if you only want to run the Android Studio Emulator.

The only thing you have to do is to give your user (i.e. the one you are logged in with) the right to access the /dev/kvm-device.

This is done in three simple steps.

First:

Create the kvm-group

groupadd -r kvm

The option -r creates a system group, i.e. with a GID <= 999 (see /etc/login.defs => SYS_GID_MAX)

Second:

Change permissions on /dev/kvm. This could be done as part of the qemu-kvm-installation, because one of the dependencies is installing qemu-system-common (on current Ubuntu systems, package name may vary), which in turn installs the file /lib/udev/rules.d/60-qemu-system-common.rules containing the following:

KERNEL=="kvm", GROUP="kvm", MODE="0660"

So if you are just create a file /etc/udev/rules.d/60-qemu-permissions.rules containing the above line, you are done with the first step.

Third:

Add your username to the group by executing

usermod -a -G kvm <your_username> - the -a is important for adding your user to the kvm-group. Without that you will overwrite the group-settings for your user to only belonging to "kvm"...

That's it.

For the new udev rule and group setting to take effect it's easiest to reboot and login again.

You can also execute

udevadm control --reload-rules && udevadm trigger

for reloading the rules but you still have to logout and login again with regard to the new group.

Btw, +1 for pointing out that installing `qemu-kvm` is _completely unnecessary_ for Android Studio. **This is the best answer** — MestreLion, Sep 23 '20 at 13:55

score 14 · Answer 12 · 2019-03-16T19:36:33.757

14

I countered the same problem and to solve this issue just type the following commands in terminal for Linux clients

   sudo apt-get install qemu-kvm

    // type your password

   sudo chmod 777 -R /dev/kvm

and after that try running simulator it'll work

edited Mar 16 '19 at 19:36

answered Mar 16 '19 at 17:54

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God, no. See my comments above. – andrzejwp Mar 31 '20 at 16:15
Superfluous install of qemu-kvm, superfluous use of recursive option and superfluously sets executive permission. Also non persistent over reboots and even during runtime of udev. – maxschlepzig May 24 '20 at 10:51

score 9 · Answer 13 · answered Feb 21 '19 at 11:36

9

sudo setfacl -m u:$USER:rwx /dev/kvm

Worked for me.

answered Feb 21 '19 at 11:36

Ritwik

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Way better than all the `chown` examples here, but I would omit the `x` from the permissions. – Gerd Nov 01 '19 at 12:42
Change isn't not persistent over reboots. – maxschlepzig May 24 '20 at 10:54

score 6 · Answer 14 · answered Jun 17 '19 at 02:00

6

I am using linux debian, and i am facing the same way. In my AVD showing me a message "/dev/kvm permission denied" and i tried to find the solution, then what i do to solve it is, in terminal type this :

sudo chmod -R 777 /dev/kvm

it will grant an access for folder /dev/kvm,then check again on your AVD , the error message will disappear, hope it will help.

answered Jun 17 '19 at 02:00

Cevin Ways

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This is completely wrong. Do not do that, ever. See my comments above. – andrzejwp Mar 31 '20 at 16:15
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@andrzejwp: comments above, WHERE?! – Dan Dascalescu Apr 22 '20 at 05:17
Recursive option is superfluous, execution permissions are superfluous. Change not persistent over reboots. Change not stable during udev runtime. – maxschlepzig May 24 '20 at 10:53

score 3 · Answer 15 · answered Jun 18 '19 at 10:09

3

This Worked For Me on Linux (x18) ☑ Hope It Will Work For You Aswell

sudo chown hp /dev/kvm

answered Jun 18 '19 at 10:09

Varun Pradhan

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No it wont, and please do not do that. – andrzejwp Mar 31 '20 at 16:15
Change is not persistent over reboots. – maxschlepzig May 24 '20 at 10:56

score 3 · Answer 16 · answered Aug 26 '19 at 06:55

Just one slight improvement on Jerrin's answer on fixing this error with Ubuntu 18.04 by utilizing $USER variable available in the bash terminal. So you could use the following commands two commands:

sudo apt install qemu-kvm

Add the current user to the kvm group

sudo adduser $USER kvm

Also if you are still having issues, one other problem for me was the way in which I installed Ubuntu. I made the mistake of checking the box during installation for installing 3rd party software which did not play nice with my nvidia graphics card for development. So I reinstalled Ubuntu with this third party software unchecked.

Then after installation, open up Software & Updates and go to the Additional Drivers tab. Select the most up to date proprietary drivers that have also been tested and apply changes. Should restart the machine for the changes to take affect.

score 3 · Answer 17 · answered Apr 21 '20 at 14:01

3

What finally fixed it for me on Ubuntu 18.04 was:

sudo apt install qemu-kvm
sudo adduser $USER kvm
sudo chown $USER /dev/kvm

answered Apr 21 '20 at 14:01

James Hooper

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Duplicate of [Jerin A Mathews'](https://stackoverflow.com/a/51003471/427158). – maxschlepzig May 18 '23 at 11:17

score 1 · Answer 18 · answered Oct 01 '20 at 14:30

1

I tried sudo setfacl -m u:UserName:rwx /dev/kvm . and it works .
In the android studio you need to change : tools> avd manager >(chose the pen to edit your device and change 'graphics' from automatic to software ) to avoid emulator drawable error

answered Oct 01 '20 at 14:30

Mehul V.

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score 1 · Answer 19 · answered Sep 28 '22 at 12:45

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Here is what I did:

user@user:~$ whoami

antonio

sudo apt install qemu-kvm

sudo adduser antonio kvm

sudo chown antonio /dev/kvm

last but not least

On Android studio select File -> Restart IDE

to apply the changes

Then create the emulator

answered Sep 28 '22 at 12:45

Jose Antonio

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score 0 · Answer 20 · answered Jul 23 '18 at 09:40

0

I was in a similar situation with the same error of permissions on /dev/kvm I had done the necessary installations but not added the user to the kvm group All I had to do was

sudo adduser <Replace with username> kvm

and ofcourse DON'T forget to restart your Ubuntu instance.

answered Jul 23 '18 at 09:40

Vineet Jain

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Isn't logout/login enough? – user1053510 Nov 05 '18 at 09:40
@user1053510 After adding a user to a group there's no need to reboot (even after 3.5 years ;-) ) – Gerd Jun 14 '22 at 09:46

score 0 · Answer 21 · answered Nov 23 '22 at 06:09

0

/dev/kvm permission denied android studio

[Motherboard]Set VT(Virtualization Technology) in BIOS and install Virtual Machine

answered Nov 23 '22 at 06:09

Yogesh Bangar

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score -1 · Answer 22 · answered Sep 10 '18 at 05:30

-1

I got this error after updating my ubuntu to 18.04.1. I just download new system image for emulator or you can say that download new emulator and it is worked for me.

answered Sep 10 '18 at 05:30

Prashant Sharma

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This won't change anything regarding the original problem with `/dev/kvm`-permissions. – Gerd Nov 01 '19 at 12:44

Damindu Lakmal · Answer 23 · 2019-04-10T06:06:48.837

-1

Open Terminal and log as admin

sudo su

Go to the dev folder

cd /dev/

Change the kvm mode

chmod 777 -R kvm

edited Apr 10 '19 at 06:06

answered Apr 06 '19 at 06:27

Damindu Lakmal

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I think you mean `cd /dev` instead of sudo. – JJJ Apr 06 '19 at 06:46
yeah, cd /dev . – Damindu Lakmal Apr 10 '19 at 06:06
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This works. But have to do this every time computer restarts. – Lanil Marasinghe Apr 16 '19 at 06:26
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Why do you call `chmod` with `-R`? Recursively changing the permissions on a single device file `/dev/kvm` doesn't look too useful. Also, execute permissions are superfluous on that device. Finally, udev may readjust the `/dev/kvm` permissions after each run. Thus, this method isn't very effective. – maxschlepzig May 24 '20 at 10:04

score -1 · Answer 24 · answered Jul 18 '19 at 23:17

-1

Type in terminal:

sudo apt install qemu-kvm -y
sudo chown $USER /dev/kvm

answered Jul 18 '19 at 23:17

John Deer

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score -1 · Answer 25 · answered Apr 29 '20 at 10:32

Although KVM is a module built into the Linux kernel itself, it doesn't mean that all the necessary packages are included in your Ubuntu/Linux install by default. You'll need a few to get started, and they can be installed with this command in the terminal:

& sudo apt install qemu-kvm libvirt-clients libvirt-daemon-system bridge-utils virt-manager

Configure the network bridge

In order for your virtual machines to access your network interface and be assigned their own IP addresses, we need to configure bridged networking on our system.

First, run the following Linux command in order to find out what name your network interface has been assigned. Knowing this will allow us to do additional configuration later.

$ ip a

In my case, the network interface is called enp2s0. Yours will likely be very similarly named.

In order to tell Ubuntu that we want our connection to be bridged, we'll need to edit the network interfaces configuration file. Doing this won't negatively impact your connection at all. It'll just allow that connection to be shared with the VMs.

Use code (Visual Studio Code) or your favorite text editor to open the following file:

$ code /etc/network/interfaces

When you first open this file, it may be empty or contain just a couple of lines. Your bridge interface is called br0, so add the following line for the interface to come up by default:

auto br0

Below this line, add the following line for your current network interface (the one who's named you determined earlier).

iface enp2s0 inet manual

Next, you can add the bridge information. These lines tell Ubuntu that your bridge will use DHCP for automatic IP address assignment, and your bridge will manage your current interface.

iface br0 inet dhcp
      bridge_ports enp2s0

This is how your file should look once all the changes have been applied (if you also have a couple of lines that were already there, it's fine to have them too):

Save your changes and exit the file.

Add your user to the groups

In order to manage your virtual machine(s) without root privileges, your user will need to belong to two user groups. Run the following commands to add your user to the appropriate groups (replacing user1 with the name of your user):

$ sudo adduser user1 libvirt
$ sudo adduser user1 libvirt-qemu
$ sudo adduser user1 kvm

When you're done, you should restart your system to ensure that all of the changes done to your user and network configuration have a chance to take effect.

Downvote: This thread isn't about getting KVM to work. It's just about omitting a "permission denied" message while starting the Emulator packaged with Andoid Studio. No need for `libvirt` and no need for configuring interfaces... — Gerd, May 06 '20 at 12:51
While I'm very new to Android development, I bet it does most of these steps for you. It does ask you to [install many of the same packages](https://developer.android.com/studio/run/emulator-acceleration?utm_source=android-studio#vm-linux-kvm), though. (Expecting every Android developer to properly set up a bridge is a bit in left field, even limited to *Linux* Android developers.) — jpaugh, May 10 '20 at 21:36

score -2 · Answer 26 · answered May 13 '20 at 05:47

-2

In order to make a virtual device in Linux - I have to follow this three command and it helps me to avoid trouble for building avd devices - the process are -

sudo apt install qemu-kvm
sudo adduser $USER kvm
sudo chown $USER /dev/kvm

so, now you are good to go, restart android studio and start building application with emulator.

answered May 13 '20 at 05:47

Mehedi Abdullah

772
10
13

Duplicate of [James Hooper's answer](https://stackoverflow.com/a/61345425/427158). – maxschlepzig May 18 '23 at 11:13

score -3 · Answer 27 · answered May 14 '20 at 19:14

-3

Provide appropriate permissions with this command

sudo chmod 777 -R /dev/kvm

answered May 14 '20 at 19:14

code.rookie

346
2
6

See also my comments to a similar answer: https://stackoverflow.com/questions/37300811/android-studio-dev-kvm-device-permission-denied#comment109628944_55546477 – maxschlepzig May 24 '20 at 10:06
It worked for me – Saurabh Chavan Jan 11 '22 at 05:09

score -5 · Answer 28 · answered Jun 12 '18 at 22:17

-5

Running the below command in Ubuntu 18.04 worked for me sudo chown -R /dev/kvm

answered Jun 12 '18 at 22:17

mtoto_dev

1

2

First: Never change ownership of system files --- Second: As `/dev/kvm` is a file `-R` has no effect --- Third: `chown` needs a `new owner` argument --- Fourth: After rebooting you have to do this again and again. – Gerd Nov 01 '19 at 12:29

score -10 · Answer 29 · answered Sep 14 '18 at 15:07

-10

If you open your ide with sudo. You are not going to have this problem.

answered Sep 14 '18 at 15:07

Merve Sims

1
2

8

why on earth I need sudo permissions to develop an android app? – techcraver Oct 27 '18 at 06:52
1

Emphasizing again: one must never do this. Also look into gksu and gksudo for running GUI apps as root. – Manish Nov 04 '18 at 08:25