ruby isn't managed via alternatives in the Debian package. It is likely that you broke your system by installing third-party packages or something. You are on you own, sorry.
** Changed in: libgems-ruby (Ubuntu) Status: New => Invalid -- package rubygems1.9.1 1.3.5-1ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2 https://bugs.launchpad.net/bugs/581792 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs