Looking at the calibre Linux install page, there is a item under notes:
Quote:
If you get an error Could not load the Qt platform plugin xcb you are missing some needed X11-XCB libraries, such as libxcb-cursor0 or libxcb-xinerama0, for details see here.
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Where here is is a link to a Mobileread thread:
Calibre 5.0.1 Could not load the Qt platform plugin "xcb" FIXED