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

[Brian Murray]

You have the unity package installed which lubuntu wants to uninstall,
but we have marked it as something not to be removed in the release
upgrade process because that would be bad for an Ubuntu install.  If you
manually remove the package before the upgrade it should then be
calculable.

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

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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:
  Incomplete

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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