Just restarted my computer and this happens, tried switching desktop managers and the same thing. Help?
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Step #1 = After logging in to the blank desktop press "control + alt + t". This will open a terminal.
Step #2 = In terminal type "sudo start lightdm". This will start lightdm, and prompt you to login again.
Step #3 = When logging in click the Ubuntu logo and verify it's logging you into "ubuntu" rather than a fallback session. After logging in you should see Unity running. If not you may have a configuration issue, and should proceed to step 4.
Step #4 = In terminal type "sudo gedit /etc/lightdm/lightdm.conf". This will open the configuration file for lightdm. The file should read nothing on line one, "[SeatDefaults]" on line 2, "user-session=ubuntu" on line 3, and "greeter-session=unity-greeter" on line 4.
This post may also be an interesting read depending which version of ubuntu you have: After upgrading to 13.04 Unity interface is not showing
