You have to go to terminal and list the processes and ki- ll the locked up process. http://ubuntuhandbook.org/index.php/2013/09/easily-kill-frozen-locked-up-app-window-ubuntu/ http://www.makeuseof.com/tag/6-different-ways-to-end-unresponsive-programs-in-linux/
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You have to go to terminal and list the processes and ki- ll the locked up process. http://ubuntuhandbook.org/index.php/2013/09/easily-kill-frozen-locked-up-app-window-ubuntu/
http://www.makeuseof.com/tag/6-different-ways-to-end-unresponsive-programs-in-linux/