[Bug 1641373] Re: "An unresolvable problem occurred while calculating the upgrade" to Yakkety

[Steven Collins]

After digging around some related bugs and from there poking around
/var/log/dist-upgrade, I concluded that it was getting stuck on rdnssd,
which I wasn't really using anyway. I removed it, and have at least so
far gotten past this error.

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https://bugs.launchpad.net/bugs/1641373

Title:
  "An unresolvable problem occurred while calculating the upgrade" to
  Yakkety

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

Bug description:
  "This can be caused by:
  * Upgrading to a pre-release version of Ubuntu
  * Running the current pre-release version of Ubuntu
  * Unofficial software packages not provided by Ubuntu"

  None of this applies. I *did* have unofficial software packages when I
  first got this error, but I removed all of them, I believe (removed
  everything under "Obsolete ... Packages" in aptitude). Still getting
  the error.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.17
  ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
  Uname: Linux 4.4.0-47-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: LXDE
  Date: Sat Nov 12 20:12:11 2016
  InstallationDate: Installed on 2016-02-21 (265 days ago)
  InstallationMedia: Lubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2016-11-13 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2016-08-21T21:46:34.658796

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