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Issue tracker for Linux version of Steam
GRUB was a nightmare for me when things went wrong (EndeavourOS / Arch). I think you can say that to a lot of critical Linux system components though. Mint is generally one of the more stable distros out there though and generally considered to be the better Ubuntu.
The cinnamon desktop is super nice, but mint didn't play well with my gpu for some reason, but you can install the desktop environment on Ubuntu.