[NotAMobofCrows]

Originally Posted by DNSB

See Calibre 5.0.1 Could not load the Qt platform plugin "xcb" FIXED for one example. Kovid's suggestion of installing libxcb-xinerama0 seems to have worked for several people.

In my case, had to install the whole thing. Still get the same error if I install just the "libxcb-xinerama0" package. Had noticed that thread before, but thanks.