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[Christian Bachmaier <chris@xxxxxxxxxxxxxxxxxxxxxxxxx>]

Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Attachment added: "apport.linux-image-4.3.0-5-generic.8omxt4_7.apport"
   https://bugs.launchpad.net/bugs/1531455/+attachment/4544867/+files/apport.linux-image-4.3.0-5-generic.8omxt4_7.apport

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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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