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Yakuake:
If you find yourself frequenting the terminal, then Yakuake is the perfect solutionfor you. Yakuakestands for Yet Another Q(K)uake Style Terminal Emulator, it is small app, which at the press of a hotkey drops down a terminal window over your screen, exactly like Quake. You can customise the hotkey, transparency and a host of other options. The default is [F12]. To install type $ sudo apt-get install yakuake.
Stop a hung application:
If an application gets hung, and even the force quit option is not working, open a terminal and type $ sudo killall <appname>.
If you don't know the application name, you can type in the first few letters, and press [Tab] a couple of times to autocomplete. If the above still doesn't work try $ ps - e | grep <appname>.
This will display the app with its corresponding process id. Then type $ kill -9 <Process Id> and it will shutdown the application. You can also enter any subset of the application name, and it will find it for you.