Besides the login problem (wrong first attempt to login, then right password ,leads to a purple screen and nothing else happens) there is another problem when you are in gnome-shell if you issue ctrl-alt f4 you cannot get back with ctrl-alt f7
Besides the login problem (wrong first attempt to login, then right password ,leads to a purple screen and nothing else happens) there is another problem when you are in gnome-shell if you issue ctrl-alt
f4 you cannot get back with ctrl-alt f7