I suppose that you made some changes in Compizconfig setting manager so that you lost control over unity.
Originally Posted by ayebk123
I suggest that you remove compizconfig setting manager and re-install unity and desktop to make sure everything went back the way it should.
to remove compizconfig setting manager use the following commands:
to re-install unity and desktop and compizconfig again:
sudo apt-get remove compizconfig-settings-manager
sudo apt-get remove compiz-plugins-extra
sudo apt-get purge compiz*
Reboot and I hope it works
sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get install unity-2d
sudo apt-get install ubuntu-desktop
sudo apt-get install ubuntu-desktop-2d
sudo apt-get install compizconfig-settings-manager
sudo apt-get install compiz-plugins-extra
sudo apt-get install unity
Report here any messages you get during the operation.