Public bug reported:

Following advice as per Release Notes
(https://wiki.ubuntu.com/VividVervet/ReleaseNotes)

Just upgraded from 14.10 to 15.04 and now  Ubuntu fails to start from powering 
up. I select 'ubuntu' on the grub loader screen and then get a blank screen. 
Computer just hangs. Have tried Ctrl + Alt  + 1 etc, and also leaving for 
several minutes but nothing happens.
Once I power down manually and restart and try again I see a message 'ACPI PCC 
Probe failed, starting version 219' and PC boots OK.

This has repeated each time from scratch.

FYI 
lsb_release -rd
RegardsDescription:    Ubuntu 15.04
Release:        15.04

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1480642

Title:
  systemd-boot

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