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Common left panel (launcher) is disable too.

I think i should reset settings. How can i do it? PS i can start terminal.

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up vote 3 down vote accepted

From your keyboard CTRL+ALT+T will give you terminal and type there as ccsm .That will launch compiz settings manager .there you can re-enable your Unity.

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OMG! I made "apt-get install unity" and it was with error. After reboot i can see blue screen with "Ubuntu loading" and nothing more. I can jump to CTRL+ALT+F1. Is this the end? :)) – Nwbie Sep 3 '12 at 18:01
are you able to launch terminal even in that blue screen ? – Raja Sep 3 '12 at 18:03
Yes, Sir! What can i do? :) – Nwbie Sep 3 '12 at 18:04
in the terminal type as ccsm and check unity as enabled – Raja Sep 3 '12 at 18:06
there is an error: "could not open display", "..object has no attribute 'get_default_screen'". What can i reintall ? – Nwbie Sep 3 '12 at 18:10

If CTRL+ALT+T is not working (doesn't open a Terminal), try this:

Right click & add a folder, click on the folder to open the File Manager, go to /usr/share/applications, from there you can start CompizConfig & enable the Unity plugin.

Source (Thanks @Raja)

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