Package: lxde Version:9_all When I login to the GUI X screen an error message appears reading "No session for pid ...." where .... is a pid and is different for each login. Checking on the inet found the problem reported by others but a suggested work around didn't work for me or for someone else. The pid always maps to lxpolkit. You have to click "OK" on this error message to get rid of it.
David Lawyer