Hi, just upgraded to Lubuntu 17.10 and found I was affected by https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=842184 As a workaround I added to ~/.config/lxsession/Lubuntu/autostart This line: @/usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1 Hope this will help someone :)