Hello,
For glade 4.4.62 I get for kubuntu 14.02 64bit (and kubuntu 15.10 64bit) this error message:
This application failed to start because it could not find or load the Qt platform plugin "xcb".
Available platform plugins are: linuxfb, minimal, offscreen, xcb.
Reinstalling the application may fix this problem.
Best regards,
Ewald