E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Question

I want to install firefox in linuxmint

I run this command:

sudo apt install firefox

It shows error:

Reading package lists... Done Building dependency tree
Reading state information... Done The following packages were automatically installed and are no longer required: linux-headers-5.4.0-65 linux-headers-5.4.0-65-generic linux-image-5.4.0-65-generic linux-modules-5.4.0-65-generic linux-modules-extra-5.4.0-65-generic Use 'sudo apt autoremove' to remove them. The following additional packages will be installed: xul-ext-ubufox Suggested packages: fonts-lyx The following NEW packages will be installed: firefox xul-ext-ubufox 0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded. Need to get 56.5 MB/56.5 MB of archives. After this operation, 223 MB of additional disk space will be used. Do you want to continue? [Y/n] Y Get:1 https://mintmirror.netfirst.in ulyssa/upstream amd64 firefox amd64 86.0.1+linuxmint1+ulyssa [56.5 MB] Err:1 https://mintmirror.netfirst.in ulyssa/upstream amd64 firefox amd64 86.0.1+linuxmint1+ulyssa
Hash Sum mismatch Hashes of expected file:

• SHA256:3dea5921498fda8bcf3ce9b661d597aeab1e38f164825414d38b3ff486cf6ab8
• SHA1:f0456c06b42f5ce025d33ca92cc50637922bba7c [weak]
• MD5Sum:b32026167d2427b9a5e6b8915f46d10f [weak]
• Filesize:56464752 [weak] Hashes of received file:
• SHA256:76b4d52415582d9491423724487a3846b3def8e561ed522122e78c1f2db0812f
• SHA1:396fef8f0c5a5139f0f417098c51bd63951c17a2 [weak]
• MD5Sum:f84d1dc6e70e0251b33848e7bb0565bc [weak]
• Filesize:56464752 [weak] Last modification reported: Mon, 15 Mar 2021 13:31:04 +0000 Fetched 56.5 MB in 9s (6,636 kB/s)
  E: Failed to fetch https://mintmirror.netfirst.in/pool/upstream/f/firefox/firefox_86.0.1+linuxmint1+ulyssa_amd64.deb Hash Sum mismatch Hashes of expected file: - SHA256:3dea5921498fda8bcf3ce9b661d597aeab1e38f164825414d38b3ff486cf6ab8 - SHA1:f0456c06b42f5ce025d33ca92cc50637922bba7c [weak] - MD5Sum:b32026167d2427b9a5e6b8915f46d10f [weak] - Filesize:56464752 [weak] Hashes of received file: - SHA256:76b4d52415582d9491423724487a3846b3def8e561ed522122e78c1f2db0812f - SHA1:396fef8f0c5a5139f0f417098c51bd63951c17a2 [weak] - MD5Sum:f84d1dc6e70e0251b33848e7bb0565bc [weak] - Filesize:56464752 [weak] Last modification reported: Mon, 15 Mar 2021 13:31:04 +0000 E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Anything helpful information would be appreciable. Thanks in advance.

Answer 1

This happens because you didn't closed that port properly and the connection/port is still running in the background. (Maybe you exited by pressing ctrl+z instead of ctrl+c) You can use this to kill that process:

sudo fuser -k 8000/tcp

Note: 8000 is the port number.

Answer 2

There could be some other program using the port 8000.

You could try using

sudo netstat -tulpn | grep 8000

to see what process is using port 8000.