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[Christian Bachmaier <chris@xxxxxxxxxxxxxxxxxxxxxxxxx>]

When using Vurtual Box's Intel Pro/1000 MT Desktop emulation then
everything works with all kernels I have tested so far.

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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 under latest Oracle Virtual Box 5.0.12 on Windows. After issuing 'shutdown -r now' the following boot process is not successful 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 behavior was introduced with kernel 4.3, but I
  cannot swear on it.

  ---
  AlsaDevices:
   total 0
   crw-rw----+ 1 root audio 116,  1 Jan  6 11:34 seq
   crw-rw----+ 1 root audio 116, 33 Jan  6 11:34 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.19.3-0ubuntu2
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=cbc2edd0-9886-40c6-bf14-d75f638fc4cf
  InstallationDate: Installed on 2015-12-23 (14 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151115)
  IwConfig:
   enp0s3    no wireless extensions.

   lo        no wireless extensions.
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  Package: linux (not installed)
  PciMultimedia:

  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.3.0-5-generic root=UUID=07e383b5-7e12-4530-8ae0-75c104f67e2b ro
  ProcVersionSignature: Ubuntu 4.3.0-5.16-generic 4.3.3
  RelatedPackageVersions:
   linux-restricted-modules-4.3.0-5-generic N/A
   linux-backports-modules-4.3.0-5-generic  N/A
   linux-firmware                           1.154
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 4.3.0-5-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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