

If you install from source, you are on your own. Sudo mkdir -p /opt/calibre & sudo rm -rf /opt/calibre/* & sudo tar xvf /path/to/downloaded/calibre-tarball.txz -C /opt/calibre & sudo /opt/calibre/calibre_postinstall Source install WARNING: calibre is a highly complex piece of software with lots of very finicky dependencies. Assuming you want calibre in /opt/calibre, run the following command, changing the path to calibre-tarball.txz below as appropriate: If you wish to revert to an earlier calibre release or download a calibre upgrade manually, download the tarball of that release from here (choose the 32-bit or 64-bit version, as appropriate). Sudo -v & sudo calibre-uninstall & wget -nv -O- | sudo sh /dev/stdin version=4.23.0Ĭhange 4.23.0 above to whatever version you want installed.

You can install a previous calibre release, like this: Wget -nv -O- | sh /dev/stdin install_dir=~/calibre-bin isolated=y

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.
