Well, my fault here. It seemed that during the upgrade, libruby1.8 wasn't upgraded with ruby1.8 because some -dev packages were blocking it (libreadline-ruby1.8 ruby-dev ruby1.8-dev to be precise), causing irb libraries to be missing.
After removing these packages and upgrading libruby1.8, the problem was resolved. You can close this bug. Thanks, -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
