[ubuntu] Unity desktop 3D installed doesn't work although it did from Live CD

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http://ubuntuforums.org – I have used Xubuntu happily for a couple of years but I want to try out the Unity desktop with a view to switching to it. I tried Ubuntu 12.04 (same as my version of Xubuntu) from Live CD and it appeared to work perfectly so I installed the desktop using Code: sudo apt-get install ubuntu-desktop No problems were reported with the installation, however when I log in now only Unity 2D works. If I select the 'Ubuntu' (3D) option at login the process stops with the desktop wallpaper: no panel, no launcher; and I have to log out to resume. Can any one give advice as to what might be wrong? M (Hardware)