Radiant: Error: Could not load the Qt platform plugin "xcb" in Linux even though it was found.

Radiant: Error: Could not load the Qt platform plugin "xcb" in Linux even though it was found.

Description:
When starting Radiant software on Ubuntu OS, the following error might occur:

Error: Could not load the Qt platform plugin "xcb" in Linux even though it was found.

This is a missing library dependency issue of the Software. 

Solution:
Please try to use the below command to install the appropriate xcb libraries needed by Radiant:

sudo apt-get install libxcb-xinput0 libxcb-xinerama0

It is also recommended to check if all library dependencies of Radiant is present in your system.
Refer to the Linux Installation Guide of Radiant for more information.