[Bug 1573103] Re: my lubuntu cannot upgrade from 14.04 to 16.04, want to know why?

[Launchpad Bug Tracker]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no
activity for 60 days.]

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1573103

Title:
  my lubuntu cannot upgrade from 14.04 to 16.04, want to know why?

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

Bug description:
  Hi, there: 
  I install blender from zip but not from apt source. is this the cause that I cannot upgrade the system?

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.19.0-58.64~14.04.1-generic 3.19.8-ckt16
  Uname: Linux 3.19.0-58-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: LXDE
  Date: Thu Apr 21 23:20:22 2016
  InstallationDate: Installed on 2015-12-25 (118 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-04-21 (0 days ago)
  VarLogDistupgradeTermlog:

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