Qt-Creator does not start

BoboFuego

Hello, I just had a fresh new install of Qt 6.2.2 on Ubuntu 20.04.3 LTS, and at the first attempt of running Qt-Creator it logs out the error below and the application does not start!
./qtcreator: error while loading shared libraries: libOpenGL.so.0: cannot open shared object file: No such file or directory

What can I don to fix this? Thanks in advance

sierdzio

Install OpenGL drivers (sudo apt install libx11-xcb-dev libglu1-mesa-dev).

You can also launch Qt Creator without plugins by running it with flags: -noload QmlProfiler -noload QuickDesigner. https://doc.qt.io/qtcreator/creator-faq.html

BoboFuego

I tried to install the suggested packages, but they turned out to be already installed!

Me@Me:~$ sudo apt install libx11-xcb-dev libglu1-mesa-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libx11-xcb-dev is already the newest version (2:1.6.9-2ubuntu1.2).
libglu1-mesa-dev is already the newest version (9.0.1-1build1).
libglu1-mesa-dev set to manually installed.
The following packages were automatically installed and are no longer required:
  libllvm11 libqt5x11extras5 qml-module-qtquick-dialogs
  qml-module-qtquick-privatewidgets shim
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.

Anything else I can do?

BoboFuego

I also run it with the suggested flags and it won't start either!

./qtcreator -noload QmlProfiler -noload QuickDesigner
./qtcreator: error while loading shared libraries: libOpenGL.so.0: cannot open shared object file: No such file or directory

sierdzio

That's weird. Can you run any other 3D app, like glxgears (it's part of mesa-utils)?

Run locate libOpenGL.so to see where it is.

JonB

@BoboFuego

Find out whether you have a libOpenGL.so.0
Assuming so, run an ldd on it to see if it has any missing dependencies.
If qtcreator cannot locate it, set environment variable QT_DEBUG_PLUGINS=1 and run it to check if diagnostic output tells you anything about where it is looking (not sure whether this step applies, but you can always try it).

BoboFuego

this is what locate command returned:

locate libOpenGL.so
/snap/gnome-3-34-1804/66/usr/lib/x86_64-linux-gnu/libOpenGL.so
/snap/gnome-3-34-1804/66/usr/lib/x86_64-linux-gnu/libOpenGL.so.0
/snap/gnome-3-34-1804/66/usr/lib/x86_64-linux-gnu/libOpenGL.so.0.0.0
/snap/gnome-3-34-1804/77/usr/lib/x86_64-linux-gnu/libOpenGL.so
/snap/gnome-3-34-1804/77/usr/lib/x86_64-linux-gnu/libOpenGL.so.0
/snap/gnome-3-34-1804/77/usr/lib/x86_64-linux-gnu/libOpenGL.so.0.0.0
/snap/gnome-3-38-2004/87/usr/lib/x86_64-linux-gnu/libOpenGL.so
/snap/gnome-3-38-2004/87/usr/lib/x86_64-linux-gnu/libOpenGL.so.0
/snap/gnome-3-38-2004/87/usr/lib/x86_64-linux-gnu/libOpenGL.so.0.0.0

what can I do to make qtcreator be aware of it's location?

sierdzio

That looks like a sandbox for some snap app. You could try adding that to LD path:

export LD_LIBRARY_PATH=/snap/gnome-3-38-2004/87/usr/lib/x86_64-linux-gnu
./qtcreator

But it would be better to install OpenGL for the whole system, not only for that snap package.

BoboFuego

So what can I do to install it? And which package should I install in order to have that shared lib for the whole system?

sierdzio

Go to system settings or software sources and find "Additional Drivers" - there select proper driver for your GPU.

Or you can install a software renderer with mesa, but sorry I don't remember the package name. It's definitely much better to pick proper GPU driver instead.

BoboFuego

I have an Intel Graphic card, and from Ubuntu' forum I understood that Intel Graphics driver's are preinstalled in the kernel, thus it shouldn't be a GPU driver issue.
And to give you some more info, I just install qtcreator 4.11.0 from Ubuntu package manager and it runs without issues, the problem appears only with the newest version I installed from Qt-website

sierdzio

Oh hey, this is a Qt C bug! It's fixed in Creator 6.0.1: https://www.qt.io/blog/qt-creator-6.0.1-released

bwillard

@sierdzio It doesn't work for me with Qt Creator 6.0.1 either.