Install Qt on Ubuntu

Question

Need to build simple GUI application. For this reason I decided to install Qt on my Ubuntu 16. I have downloaded open source Qt edition from theirs site. Got error while run:

g@ubuntu:~/Downloads$ ./qt-unified-linux-x86-2.0.5-2-online.run 
./qt-unified-linux-x86-2.0.5-2-online.run: error while loading shared libraries: libX11.so.6: cannot open shared object file: No such file or directory

How to fix that?

`sudo apt-get install qt` brings `E: Unable to locate package qt` — vico, Jan 08 '18 at 09:35
Try `apt-cache search qt` first and then pick the according packages. — Ulrich Eckhardt, Jan 08 '18 at 09:46

score 130 · Answer 1 · edited Jan 08 '18 at 13:37

130

Install Qt

sudo apt-get install build-essential

sudo apt-get install qtcreator

sudo apt-get install qt5-default

Install documentation and examples If Qt Creator is installed thanks to the Ubuntu Sofware Center or thanks to the synaptic package manager, documentation for Qt Creator is not installed. Hitting the F1 key will show you the following message : "No documentation available". This can easily be solved by installing the Qt documentation:

sudo apt-get install qt5-doc

sudo apt-get install qt5-doc-html qtbase5-doc-html

sudo apt-get install qtbase5-examples

Restart Qt Creator to make the documentation available.

Error while loading shared libraries

Problem:

radiusd: error while loading shared libraries: libfreeradius-radius-2.1.10.so: cannot open shared object file: No such file or directory

Reason:

Actually, the libraries have been installed in a place where dynamic linker cannot find it.

Solution:

While this is not a guarantee but using the following command may help you solve the “cannot open shared object file” error:

sudo /sbin/ldconfig -v

http://www.lucidarme.me/how-install-documentation-for-qt-creator/

https://ubuntuforums.org/showthread.php?t=2199929

https://itsfoss.com/error-while-loading-shared-libraries/

ModelSim-Altera error

edited Jan 08 '18 at 13:37

api55

11,070
4
41
57

answered Jan 08 '18 at 09:31

John Rajan

1,627
2
10
19

4

(Ubuntu 20.04): installing qtcreator before qt5-default (qt5-qmake) prevented qtcreator from automatically detecting qmake. This had to be manually added via; 1) `qtcreator - tools - options - Qt Versions - Manual - Add - qmake location: /usr/lib/x86_64-linux-gnu/qt5/bin/qmake`, 2) `qtcreator - tools - options - Manual - Desktop (default) - Qt version - Qt 5.xx` – user2585501 Sep 17 '20 at 12:24
The comment above was spot on! I accidentally installed `qtcreator` before `qt5` and had issues, e.g. the creator wasn't showing the examples (Ubuntu 20.04). Following the steps fixed it. – fr_andres May 09 '21 at 18:29
Now that Qt 6 is out, it seems best to install "qt5-default" first, then "qtcreator", correct ? (supposing you want Qt 5) – cdahms Oct 31 '21 at 18:38
user2585501 give solution for my case. – Trần Hoàng Kim Long Sep 19 '22 at 09:34
UPDATE: qt5-default no longer exists. If anyone has a workaround, please tell. Need to install the libs for runtime only, not dev work. – guitarpicva Apr 21 '23 at 16:38

Botje · Accepted Answer · 2023-04-24T07:38:29.923

85

Before Debian 11 / Ubuntu 20.10, the ubuntu package name was qt5-default.

This package was deprecated and now you should install qtbase5-dev, or one of the individual Qt modules if you just want the runtime:

libqt5concurrent5
libqt5core5a
libqt5dbus5
libqt5gui5
libqt5network5
libqt5printsupport5
libqt5sql5
libqt5test5
libqt5widgets5
libqt5xml5

The corresponding Qt6 package is qt6-base-dev (note the extra -).

edited Apr 24 '23 at 07:38

answered Jan 08 '18 at 09:42

Botje

26,269
3
31
41

6

Installing the `qtcreator` package will also give you the IDE. – code_dredd Jan 08 '18 at 10:13
1

If for some reason you need the lower Qt 4 version, `qt4-default` is also available. – Gino Mempin Apr 14 '20 at 00:29
1

this package no longer exists! – guitarpicva Apr 21 '23 at 16:38

Aaron · Answer 3 · 2019-09-16T10:31:49.547

In Ubuntu 18.04 the QtCreator examples and API docs missing, This is my way to solve this problem, should apply to almost every Ubuntu release.

For QtCreator and Examples and API Docs:

sudo apt install `apt-cache search 5-examples | grep qt | grep example | awk '{print $1 }' | xargs `

sudo apt install `apt-cache search 5-doc | grep "Qt 5 " | awk '{print $1}' | xargs`

sudo apt-get install build-essential qtcreator qt5-default

If something is also missing, then:

sudo apt install `apt-cache search qt | grep 5- | grep ^qt | awk '{print $1}' | xargs `

Hope to be helpful.

Also posted in Ask Ubuntu: https://askubuntu.com/questions/450983/ubuntu-14-04-qtcreator-qt5-examples-missing

score 3 · Answer 4 · answered May 03 '20 at 08:54

Also take a look at awesome project aqtinstall https://github.com/miurahr/aqtinstall/ (it can install any Qt version on Linux, Mac and Windows machines without any interaction!) and GitHub Action that uses this tool: https://github.com/jurplel/install-qt-action

score 0 · Answer 5 · answered Jun 26 '23 at 17:02

0

Download latest from your Qt account next in terminal

chmod +x qt-unified-linux-x64-4.6.0-online.run 
./qt-unified-linux-x64-4.6.0-online.run

answered Jun 26 '23 at 17:02

pedrofernandes

16,354
10
36
43

Install Qt on Ubuntu

5 Answers5

Linked