[Bug 1612886] Re: upgrade failed to calculate due to an unofficial mirror

[Ubuntu Foundations Team Bug Bot]

** Tags added: trusty2xenial

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https://bugs.launchpad.net/bugs/1612886

Title:
  upgrade failed to calculate due to an unofficial mirror

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

Bug description:
  tried to upgrade to 16.4 said error cannot complete

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.19.0-65.73~14.04.1-generic 3.19.8-ckt22
  Uname: Linux 3.19.0-65-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri Aug 12 22:02:17 2016
  InstallationDate: Installed on 2015-09-17 (330 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-08-13 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2016-08-12 21:58:40.825543
   Log time: 2016-08-12 22:00:03.082933
   Log time: 2016-08-12 22:01:51.938612
   Log time: 2016-08-12 22:02:58.773553
  VarLogDistupgradeTermlog:

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