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

[Steven Collins]

Public bug reported:

"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

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade xenial

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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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