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Dear freesurfer experts,
recently I update freesurfer to freesurfer 7.4.0 under Ubuntu 20.04. when I try to launch freeview, I get error message as:

 freeview
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, webgl, xcb.
 
Abort (core dumped)

could anyone can direct me how to solve this problem ?
sincerely 
Jung Lung Hsu

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