qgc-user-guide Add missing xcb install

I freshly installed Ubuntu LTS 20.4 and followed the Download and Install instructions. The app image failed to run because I was missing the libxcb-xinerama0 package. The solution to the error was not immediately obvious and many Ubuntu users will likely face the same problem unless the Download and install instructions have the user install the missing package.

Here is the original error I got.

sam@hp:~/Downloads$ ./QGroundControl.AppImage 
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.

Aborted (core dumped)

Feb 04 '22 00:02 gillamkid

Shouldn't the AppImage creation be updated to include this in the package? That should just always work out of the box.

Feb 08 '22 19:02 DonLakeFlyer

I'm guessing this is invalid. If not, I migrated docs to https://github.com/mavlink/qgroundcontrol/tree/master/docs/en

Can you copy the PR across? I will be archiving this in a week or so.

Dec 06 '23 20:12 hamishwillee