[ubuntu] purge gnome classic

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http://ubuntuforums.org – Hi, I installed gnome-shell in 12.10 to see if I liked it better than unity, and I didn't, so I purged it. This didn't deal with 'gnome classic' and 'gnome classic (no effects)', however, which remain on my login window. How do I remove them without also removing delicate parts of my system? Thanks. (Hardware)