or you can open Linux terminal su- to have root privileges and type in killall
To kill Gnome desktop type in
To kill KDE desktop type in
Linux training and practical guide on using basic Linux commands with step by step example. The list of basic Linux commands example that use on this site execute on Fedora Linux system using bash shell terminal. The basic Linux commands example usually publish with Linux commands screenshot and the Linux commands output himself to demonstrate how this basic Linux commands could be use, and for better understanding on how this Linux commands works.