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Each qube uses memory, so when you are done with a qube, you should shut it down to free up the memory it is using. Closing windows isn't enough — you need to shut down the qube when you're done with it. How to Install Software While Tails can install additional software through a Graphical User Interface (GUI, the "point and click" alternative to the Command Line Interface ), Qubes OS cannot at this time, so new software must be installed from the command line.