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

[Premek Brada]

Possibly affects bare metal install as well - tested on AMD Athlon XP
5000+, 4GB RAM, HDD 120GB, LCD on DVI; boot from DVD-RW: step 15+16 -
prompt to remove media and press Enter did not appear, disk was ejected
from the DVD-ROM drive, system hanged with screen suspended; after hard
reset booted into Xubuntu OK.   There is a remote possibility that
reading the DVD-RW was not 100% correct at all times.

Confirming problem on VirtualBox (setup: VirtualBox 4.3.10_Ubuntu
r93012; guest: 2CPU, 1G RAM, 1 disk dynamic resize; host: Xubuntu 12.04
LST, Lenovo T430s, i7, 8G RAM, SSD).  Does not reboot, hangs
indefinitely in the “Installation complete” screen with hourglass
turning.

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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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