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If you do not wish to continue with GNOME environment then it's best to work with command line interface to face the real-life challenges. Before you proceed, make sure that you logged in as a root user or you have use sudo   command with the root password. Open terminal to un-install GNOME and type, apt-get remove gnome-shell  and then type apt-get autoremove This will remove GUI interface from Kali Linux and you are set to work through command line interface.

As kali linux is new to all of us, being a learner we all come with a new issue and try to resolve it as quickly as possible. While installing software, most of us don't know the dependency packages that are installed or removed from the system. A great feature that kali linux provide is that when we run apt  command, it checks the available package/s in the repository and accordingly asks if to install. Meanwhile, it also checks the un-necessary packages that is not required. Here is a command that removes the un-necessary packages. From the root terminal window, please type  apt-get autoremove . When you hit 'return' or 'enter'  key, it checks the packages that is to be removed from the system. Please read those packages carefully, before you make confirmation to remove it from the system.