This application failed to start because it could not find or load the Qt platform plugin “xcb“.

BUG:

 This application failed to start because it could not find or load the Qt platform plugin "xcb".

 Reinstalling the application may fix this problem.

 Aborted

解决办法：

$ gedit ~/.bashrc

insert next path at the end of the file

export LD_LIBRARY_PATH=./your/path/Qt5.12.7/5.12.7/gcc_64/lib:$LD_LIBRARY_PATH

$ source ~/.bashrc