Quote:
Originally Posted by Gandulf
Please help. I normally use the binary code, cut a paste in terminal to upgrade calibre. But that will give me 5.42 and I want to go from 4.22 to 4.23.
Found the download file for 4.23 for Ubuntu , have downloaded it but now have no clue what to do with it. Please help how do I install it. 
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You might want to go back to the calibre download page for Linux and scroll down a bit to the Reverting to a previous version.
For example:
sudo -v && sudo calibre-uninstall && wget -nv -O-
https://download.calibre-ebook.com/linux-installer.sh | sudo sh /dev/stdin version=3.48.0