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They deprecated GNOME 2.
If people like Unity or GNOME 3, it's nice to have it but it's not an improvement over GNOME 2. It's something different. I don't expect my grand mother to learn something new so she is stuck with Ubuntu 9.10. When I installed Ubuntu for her some years ago, it was expected that the system was easy to use and would improve over time. Canonical has failed to support that experience.. Instead they have moved to Tablets. They have damaged the confidence people would put in them. They should put some resources on MATE to restore it.