Q: Ubuntu 15.04 boot hangs on “Starting light display manager” after updates

A: Try to go to tty1(Ctrl+Alt+F1)

Login and purgexorgandlightdm

sudo apt-get purge xorg lightdm

Autoremove whatever's left

sudo apt-get autoremove

Install lightdm and xorg

sudo apt-get install xorg lightdm

Q: Debian jessie boot hangs at “Started Update UTMP about System Runlevel Changes.” A: There is probably a problem with your video driver. I resolved it by following (modified) instructions at http://ubuntuforums.org/showthread.php?t=2072420:

Press Alt+F2 to switch to a new console sudo apt-get purge xserver-xorg-video-intel then reboot sudo apt-get install xserver-xorg-video-intel nano /etc/X11/xorg.conf, remove any present code (if applicable) and enter the following:

Section "Device" 
    Identifier "Card0"
    Driver "intel" 
    Option "AccelMethod" "sna" 
EndSection

Save the file and reboot

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