I don't see ANY problem with Kobo, Kindle, Nook, Sony etc on Linux Mint 20.1 (which is similar). No need to be root or use sudo. I've never had to change anything.
There is an issue with SOME MTP devices that can't be re-enabled when unmounted from the file manager. Stopping the "gvfs-mtp-volume-monitor" process before plugging in an MTP device solves that.
But the Libra uses USB Mass Storage mode. I've had no problem on 18.3 (32 or 64 bit) or 20.1 (that's 64 bit only)
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