You are probly missing some of the required qt and  x-11 libraries.
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		| If you get an error Could not load the Qt platform plugin xcb you are missing some needed X11-XCB libraries, such as libxcb-xinerama0, for details see here. 
 On servers, if you get an error about a missing libEGL, you might need to install some OpenGL packages such as libegl1 and libopengl0
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 https://calibre-ebook.com/download_linux
bernie
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		| 
					Originally Posted by willbontrager  In case it is needed for addressing the issue (and thank you so much!), here is the session when Calbre was installed. 
[ds1363]$ wget -nv -O- https://download.calibre-ebook.com/linux-installer.sh  | sh /dev/stdin install_dir=~/bontragercgi.com/calibre isolated=y 
2022-08-29 14:14:15 URL:https://download.calibre-ebook.com/linux-installer.sh  [33493/33493] -> "-" [1] 
Using python executable: /usr/bin/python3 
Installing to /home/willbont/bontragercgi.com/calibre/calibre 
Downloading tarball signature securely... 
Using previously downloaded calibre-6.3.0-x86_64.txz 
Extracting files to /home/willbont/bontragercgi.com/calibre/calibre ... 
Extracting application files...  
Run "/home/willbont/bontragercgi.com/calibre/calibre/calibre" to start calibre  
[ds1363]$ |