[Bug 1445592] Re: vivid fails to shutdown or reboot at end of installation when "reboot now" button is pressed

[gravy45]

Installing Ubuntu MATE 15.04 Release candidate 4/17/15 as Virtualbox
guest 4.3.26 - after clicking Restart now, the display/the guest
freezes.  A hard power off, and restart reveals the install went fine.

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https://bugs.launchpad.net/bugs/1445592

Title:
  vivid fails to shutdown or reboot at end of installation when "reboot
  now" button is pressed

Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  STEPS TO REPRODUCE
   1. Boot Vivid
   2. Select "Install" (not "Try before installing")
   3. Go through the installation process
   4. Upon successful installation, select "Reboot Now"

  EXPECTED RESULTS
   * system reboots

  ACTUAL RESULTS
   * system does not reboot or shutdown
   * cannot get to tty

  AFFECTS
   * images: 20160417+, all flavors
   * ubiquity 2.21.22

  NOTES
   * this was mentioned earlier in the cycle but on older bugs, so this is a regression of some kind
   * cyphermox claims this does NOT happen in the live session

  WORKAROUND
   * hard reboot

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