On 01/03/2017 12:53 AM, M. Fioretti wrote:
1) I have also installed KDE, OpenBox and other window managers.
But when I reboot and get the login screen, I see no menu to
select the window manager
This depends on the login manager you're using. If it's gdm, then after
you click on your name, there should be a little gear icon that will let
you pick the session type you want to use. Whether or not the window
manager you want is in that list depends on how it was packaged.