Tue Sep 27 21:05:44 UTC 2016

Actually, the failure to calculate the upgrade was due to the opencpn-
plugin-squiddio.  gnuplot depends on a new version of libwxbase3.0 which
is held back because the opencpn-plugin depends on the old version.

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https://bugs.launchpad.net/bugs/1618120

Title:
  I tried to upgrade from 14.04 to 16.04. Received error message (none
  of the listed conditions applies) as follows: An unresolvable problem
  occurred while calculating the upgrade.   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  If none of this applies, then please report this
  bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a
  terminal.

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

Bug description:
  Error message again:

  An unresolvable problem occurred while calculating the upgrade.

   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

  If none of this applies, then please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

  Other info:

  lsb_release -rd
  Description:	Ubuntu 14.04.5 LTS
  Release:	14.04

  apt-cache policy pkgname
  N: Unable to locate package pkgname

  What I expected: an upgrade (I upgraded another machine recently from
  14.04 to 16.04 and it worked flawlessly, smoothest upgrade I ever
  experienced)

  What happened: It stopped after this error message

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-95.142-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-95-generic i686
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Mon Aug 29 11:48:54 2016
  InstallationDate: Installed on 2011-08-09 (1847 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-08-29 (0 days ago)
  VarLogDistupgradeTermlog:

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