MY machine is running Debian 8 "Jessie". I installed Gnome desktop environment by
sudo apt-get install gnome
now every time my machine is switched on I'm presented with Gnome desktop environment whereas I want to go back to KDE (login screen doesn't let me change).
How to fix this?
I tried with sudo update-alternatives --config x-window-manager but apparently the windows manager is just a part of the whole GUI system.