Ubuntu – Upgrade from 14.04 to 16.04 failed at startup

14.0416.04bootupgrade

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.

Best Answer

  • open terminal and put following code.

    sudo apt-get update
    

    and make sure your update system have no problem.

    then enter:

     sudo apt-get install update-manager-core
     sudo do-release-upgrade