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.You need GLIBC 2.31 or higher and libstdc++.so.6.0.28 (from gcc 9.3.0) or higher to run calibre.Alternately, simply deleting the installation folder will remove 99% of the installed files. You can uninstall calibre by running sudo calibre-uninstall. You must have xdg-utils, wget, xz-utils and python ≥ 3.3 installed on your system before running the installer. Sudo -v & wget -no-check-certificate -nv -O- | sudo sh /dev/stdin If you still want to proceed, pass the -no-check-certificate option to wget, like this: If you get an error about an untrusted certificate, that means your computer does not have any root certificates installed and so cannot download the installer securely.
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