[Bug 1559463] Re: Upgrade trusty -> xenial failed - blank screen

[gerry_the_hat]

Well, found out that two screensavers were installed - the old
xscreensaver and the new light locker. I'm not sure yet, but thought
about that the two caused the trouble. For some unknown reasons, the old
xcreensaver didn't get uninstalled from my previous upgrades from the
last couple of years. Have seen complaints and bug reports for this. So,
might the case that at least one of them was active while doing the
upgrade... However, this does not explain why there was no switch into a
console possible.

As far as I have seen from the logs attached, the upgrade just
stopped...

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https://bugs.launchpad.net/bugs/1559463

Title:
  Upgrade trusty -> xenial failed - blank screen

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

Bug description:
  My upgrade partly failed. Upgrade manager prepared  the upgrade,
  downloaded the packages and went thru the installation and setup
  phase. During this phase, the display just blanked. The laptop was not
  shut down. Thought the system freezed, as I was completely locked out
  - no switch to console possible, nor a ssh login from another system.

  Solution:
  Hard reset and boot. The system booted at least, but no X, nor network connection working, just a console. A "dpkg --configure -a" resumed the setup and completed successfully. Reboot and now I have a smooth Xenial system :-)

  During the preparation I got a warning about a running screensaver and
  xclock - something and a possible lockout. The screensaver was
  actually disabled, but a process was running. Just killed it and
  proceeded.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.8
  ProcVersionSignature: Ubuntu 4.4.0-14.30-generic 4.4.5
  Uname: Linux 4.4.0-14-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sat Mar 19 14:20:48 2016
  InstallationDate: Installed on 2014-02-26 (751 days ago)
  InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2016-03-19 (0 days ago)
  VarLogDistupgradeTermlog:

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