Ubuntu: I installed the GUI twice


I somewhere read and installed GPU which had asked me for a disk space of some 900Mb. I came to know afterwards that it is nothing but the interface which is installed during installation of OS. What happens if 'apt-get install' is given for already installed package? Will that eat up my memory space?

Edit from comments: The specific command I used was sudo apt-get install qt5-default libvtk6-dev


Tim is correct. Here's what happens if you try this command with a package that is already installed (in this case vlc):

sudo apt-get install vlc  
Reading package lists... Done  Building dependency tree         Reading state information... Done  vlc is already the newest version.  

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