I've had the same error by installing ubuntu server, then lxde/lxdm, then attempting to autologin to the account set up during the server install. Here's my xsession-errors file, the one similarity that I spotted was a "polkit-gnome-1-WARNING"
I've had the same error by installing ubuntu server, then lxde/lxdm, then attempting to autologin to the account set up during the server install. Here's my xsession-errors file, the one similarity that I spotted was a "polkit- gnome-1- WARNING"