[Bug 1556446] Re: Ubuntu 14.04 crashes on upgrade to 16.04

[Pilot6]

** Attachment added: "main.log"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1556446/+attachment/4596968/+files/main.log

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https://bugs.launchpad.net/bugs/1556446

Title:
  Ubuntu 14.04 crashes on upgrade to 16.04

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I have Ubuntu 14.04.4 with 'wily' HWE stack. File system i btrfs.

  Whed I try to upgrade to wily, the systym crashes.

  I get a black screen. I can't get to tty and Alt+SysRq+REISUB does not
  reboot the system.

  After a hard reboot the system does not boot either to 4.4 or 4.2 kernels.
  Not with systemd or upstart.

  Regarding btrfs, it does not have any errors and all snapshots can be
  restored.

  I saved a shapshot of the crashed system and I can provide any
  requested logs. Now I reported from a restored system.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 4.2.0-30.36~14.04.1-generic 4.2.8-ckt3
  Uname: Linux 4.2.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Mar 12 20:08:14 2016
  InstallationDate: Installed on 2016-02-29 (11 days ago)
  InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)

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