Give GNOME Shell a spin if you're looking for a slick, new Linux desktop environment. It's similar to Unity in some ways, but more flexible in others – GNOME Shell supports extensions, which can add missing features.
GNOME Shell is the default interface in GNOME 3, and it's a clear break from GNOME 2. To try GNOME Shell without installing anything on your current system, use the Ubuntu GNOME Shell Remix live CD.
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