You can install a previous calibre release, like this: Wget -nv -O- | sh /dev/stdin install_dir=~/calibre-bin isolated=y
You can also do an "isolated" install that only touches files inside the installation folder and does not need to be run as root, like this:. Sudo -v & wget -nv -O- | sudo sh /dev/stdin install_dir=/optĬhange /opt above to whatever folder you want calibre automatically installed to. You can change the folder calibre is installed into from the default (/opt) like this: On servers, if you get an error about a missing libEGL, you might need to install some OpenGL packages such as libegl1 and libopengl0. 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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