The BZ2 archive is currently (?) missing from https://cache.ruby-lang.org/pub/ruby/3.0/ for the 3.0.0 release version.

ruby-install uses that by default on my Mac and is failing.

This works in the interim: ruby-install -u https://cache.ruby-lang.org/pub/ruby/3.0/ruby-3.0.0.tar.gz ruby 3.0.0