sudo apt-get install kde-plasma-desktop

sudo apt-get install gnome-shell

startx

/etc/X11/X is not executable
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error

chmod +x /etc/X11/X

chmod: cannot operate on dangling symlink `/etc/X11/X'

sudo dpkg-reconfigure -phigh xserver-xorg

apt-get update && apt-get upgrade
apt-get install --reinstall xserver-xorg
apt-get install --reinstall gdm gnome-desktop-environment xorg

/usr/sbin/lightdm

/usr/sbin/gdm