calibre is available in all repos but use the official binaries if you want support. A distribution version of any software is almost always strictly worse than the official version, since its the ofifcial version plus random patches added by people of lets say, very varying competence.
There is nothing scary about running bash scripts from the internet. And you dont need to run it under sudo if you dont want to, it supports an isolated mode as well.
And just for the record, the installer is a python script, not a bash script, its just wrapped in a bash script to find the right python binary to run the actual installer with.
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