Repositories normally provide well-tested packages, so they are the trusted source in general. As they should be: mixing packages from the official repository and non-managed software can make your system impossible to properly maintain if you don't know what you are doing.
I agree that this doesn't seem to be the case for calible, except perhaps for distributionts that act extra-super-carefully, to the point of providing only semi-obsolete versions of our favorite ebook management tool.
Ubuntu is definitely a member of that prudent family. Sometimes they make great decisions for the users, and sometimes they choose so poorly that they become the quasi-champions of broken-by-design software components **cough**systemd**cough**.
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