Ok, I am an Ubuntu complete newbie, and while I was trying to get to know my new system better, it seems that I changed the screen or the video driver to something wrong, and the desktop was gone, only one big picture, no sidebar no icons... nothing. I tried to reinstall Ubuntu (12.04) but no use. I run Firefox by launching the terminal (ctrl+alt+T) and write the name of the program just as it is "Firefox" and it worked with me! Any advice? Unfortunately I chose to install it to work beside the Win7 and now I have multi-boot, if this is information is going to be useful for you.
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1Possible duplicate: http://askubuntu.com/questions/17610/how-do-i-reset-my-unity-configuration – Suhaib Nov 03 '12 at 03:54
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Just had the same problem after I installed the latest Nvidia driver. You have to go back and use the default driver.
Go to System Settings → Software Sources → Additional Drivers and select Nouveau display.
Then restart by pressing the power button on the computer till it restarts.
It will then boot up looking normal again.
