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I installed compizconfig on ubuntu 12.04, and was changing the desktop effects, suddenly all menus disappeared, I can't even open terminal. I restarted several times. When I tried Ctrl+Alt+F2, logged in and typed unity --reset, it displays lot of error messages (I don't understand what they are), and finally says 'segmentation fault'. Other accounts on the system are working fine. I need help..!!

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See also: askubuntu.com/questions/80589/… – Takkat May 11 '12 at 10:46
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Compiz is very advanced tool and should be used with caution. Otherwise you will face this kind of problem.

Reset Unity

Run following in terminal.

unity --reset

Reset Unity Launcher icons

If you want to reset the Unity Launcher icons (dock bar on the left) to their initial state, run the following command:

unity --reset-icons

Reset Compiz

Run following in terminal.

sudo gconftool --recursive-unset /apps/compiz-1
sudo gconftool --recursive-unset /apps/compizconfig-1

Logout and Logback in.

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let us know if it worked. – Web-E May 11 '12 at 10:44
    
Did not work in my case – Geoffrey De Smet Jul 18 '12 at 14:17
    
I deleted all the files starting with a dot (.) on the home folder. It worked. – dsp Jul 27 '12 at 16:05
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  1. Somehow open a terminal in your x session. I created a file on my desktop called tmp.sh, edited its rights to be executable, entered sleep 100000 in it and then ran it.
  2. Run ccsm this will open the compiz configuration manager window.
  3. Do the opposite of what you did that screwed it up.
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1.: You can execute the terminal directly, it is located at /usr/bin/gnome-terminal. – Binkan Salaryman Mar 18 '15 at 12:08

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