Today morning Ubuntu prompt me to update my ubuntu from 15.04 to 15.10, I started the upgrade process, but the process hangs with the message (something like) halt because of too many errors, I had to force stop the process and Restart the computer, now since than it has been stuck in the loading ubuntu screen (gnome screen) with the error in the background
Failed to start monitor and control system power state. See
systemctl powerd.service
for details.
and a never ending wait
A start job is running for Wait for Plymouth Boot Screen to Quit (hours)