Comment 2 for bug 850734

According to the changelog, it was dropped as it has been deprecated upstream.

* The following packages were dropped because they were deprecated by
    upstream:
    - libart2-ruby
    - libart2-ruby1.8
    - libart2-ruby1.8-dbg
    - libgnomecanvas2-ruby
    - libgnomecanvas2-ruby1.8
    - libgnomecanvas2-ruby1.8-dbg
    - libgnome2-ruby
    - libgnome2-ruby1.8
    - libgnome2-ruby1.8-dbg
    - libgconf2-ruby
    - libgconf2-ruby1.8
    - libgconf2-ruby1.8-dbg
    - libglade2-ruby
    - libglade2-ruby1.8
    - libglade2-ruby1.8-dbg
    - libgtkglext1-ruby
    - libgtkglext1-ruby1.8
    - libgtkglext1-ruby1.8-dbg
    - libgnomevfs2-ruby (Closes: #583901)
    - libgnomevfs2-ruby1.8
    - libgnomevfs2-ruby1.8-dbg
    - libpanel-applet2-ruby
    - libpanel-applet2-ruby1.8
    - libpanel-applet2-ruby1.8-dbg

https://launchpad.net/ubuntu/oneiric/+source/ruby-gnome2/+changelog