[Bug 1691924] Re: do-release-upgrade fails

[Enigma]

Turned out that the culprit, despite a very long list of Broken packages
in Apt.log, was this inconspicuous line in Main.log:

DEBUG Installing 'xserver-xorg-video-all' (Distro KeepInstalledPkgs
rule)

So while technically my issue with this is fixed I think some work needs
to be done to provide better, more accurate output with regards to
issues like this.

Same problem can manifest for different users with different packages
being problematic and the Apt.log list of Broken packages in my case
actually included essential packages to my ubuntu-gnome-desktop bundle
which would have ravaged my system had I blindly removed them.

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https://bugs.launchpad.net/bugs/1691924

Title:
  do-release-upgrade fails

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

Bug description:
  I originally installed Kubuntu 16.04 but since upgraded to 16.10 and
  switched over to Ubuntu GNOME (ubuntu-gnome-desktop).

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: ubuntu-release-upgrader-core 1:16.10.10
  Uname: Linux 4.11.1-041101-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8.2
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Thu May 18 23:38:33 2017
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to yakkety on 2017-05-19 (0 days ago)

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