I have recently upgraded from 14.04 to 16.04 and I have had a few issues in upgrading. But I have fixed these and now everything works without any issues in the new version, with one exception
When I'm shutting down, the system doesn't completely shutdown. I have to forcefully shut it down by pressing the poweroff button.
I can use
sudo shutdown and
sudo reboot; these work fine, but when I shut down the system using the GUI it's not shutting down completely.