I opened my PC and found that there was no title bar available. I do not know what happened but I am not able to operate my PC. Also, shut off button is not available. My PC's shut down button is also not working. I could not do anything because the close icon was not also present.
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You should install CCSM (CompizConfig Settings Manager) by typing this command in terminal.
sudo apt-get install compizconfig-settings-manager
open it, and under effects category, enable windows decorations.
here is a similar question, you can find more ways to solve this if above doesn't work.
