After upgrading to 16.04 by using the automatic upgrade, the system hangs at startup by prompting " [OK] Started Update UTMP about System Runlevel Changes." and never comes again.
I have no idea what to do ? Any help is welcome.
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open terminal and put following code.
sudo apt-get update
and make sure your update system have no problem.
sudo apt-get install update-manager-core sudo do-release-upgrade