I was testing my system for IPv6 as follows using admin account:
- set IPv4 from automatic to link-local only
- set IPv6 to automatic
- shutdown
- boot
- got check disk
- don't remember if I got animated red dots (sorry, was focussed on other 
things)
- got boot hang with black screen

Tried:
- ESC 1x and repeatedly: no effect
- SHIFT 1x and repeatedly: no effect
- CTRL+ALT+F1: no effect
- LeftAlt+F1: no effect
- RightAlt+F1: no effect

Then tried CTRL+ALT+DEL
- got a blinking screen with Ubuntu red dots superimposed on top of verbose 
splash messages
- that led to a successful reboot

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https://bugs.launchpad.net/bugs/701060

Title:
  Boot failure

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