Install Qt on Ubuntu
C++LinuxQtUbuntuC++ Problem Overview
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?
C++ Solutions
Solution 1 - C++
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/
https://stackoverflow.com/questions/31908525/modelsim-altera-error/
Solution 2 - C++
The ubuntu package name is qt5-default, not qt.
Solution 3 - C++
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>
Solution 4 - C++
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