[Bug 1566615] Re: unable to upgrade to 16.04 - could not calculate changes

[Rained23]

*** This bug is a duplicate of bug 1069133 ***
    https://bugs.launchpad.net/bugs/1069133

Hi,

I resolved my issue by using ppa purge on ppa:oibaf/graphics-drivers.

Reinstalling default Xorg solved the upgrade issue.

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https://bugs.launchpad.net/bugs/1566615

Title:
  unable to upgrade to 16.04 - could not calculate changes

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

Bug description:
  I wanted to update to 16.04,  its give error with "Could not calculate
  changes.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Apr  6 10:22:12 2016
  InstallationDate: Installed on 2016-03-21 (16 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-04-06 (0 days ago)
  VarLogDistupgradeTermlog:

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