Replace dead distro bug report links

The Ubuntu help page returns 503, Arch moved to GitLab, and the old
Linux Mint page doesn't resolve at all. The new links should give
users a good place to start for bug reports.

Signed-off-by: Joshua Winkler <josh@bemoty.dev>
Link: https://patch.msgid.link/20261112191000.162374-1-josh@bemoty.dev
Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>