[Bug 1750723] Re: Unable to Upgrade to 16.??

[Brian Murray]

You seem to have installed a version of a package which is not the one
from the official Ubuntu archive.

>From your VarLogDistUpgradeAptlog.txt file:

Investigating (9) libdvdnav4 [ i386 ] < 5.0.3-1~trusty -> 5.0.3-1 > (
universe/libs )

The official version for trusty is 5.0.3-1. You might try reinstalling
the official one and see if that resolves the upgrade for you.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1750723

Title:
  Unable to Upgrade to 16.??

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

Bug description:
  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.

  Even though internet connection is fine, it is saying failed to
  connect net; check your internet connection. etc.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.9
  ProcVersionSignature: Ubuntu 3.13.0-101.148-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-101-generic i686
  ApportVersion: 2.14.1-0ubuntu3.27
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Feb 21 10:16:47 2018
  InstallationDate: Installed on 2014-01-14 (1498 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2018-02-21 (0 days ago)
  VarLogDistupgradeTermlog:

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