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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1531455

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1531455

Title:
  reboot under Oracle Virtual Box not possible

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Running 16.04 server without X unter latest Oracle Virtual Box 5.0.12
  on Windows. After issuing 'shutdown -r now' the following boot process
  is not successfull and hangs with message

  ---[ end of Kernel panic - not syncing: VFS: unable to mound root fs
  on unknown-block(0,0)

  If using 'shutdown -h now' and then staring the machine anew from
  Virtual Box manager, then the system starts as it should. Thus, for
  short, warm reboot hangs and cold reboot operates as desired. I have
  the feeling that this behavour was introduced with kernel 4.3, but I
  cannot swear on it.

  Imho, may also be a bug of Virtual Box.

  The result of ubuntu-bug linux is attached.

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