[Bug 1683702] Re: Cannot upgrade from 16.10 to 17.04

[Luis Alberto Pabón]

Because disabling these ppas don't remove the packages installed. In
this case, oibaf ppa had newer packages as per version numbering than
17.04 in such a way that apt was unable to resolve valid dependencies.

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https://bugs.launchpad.net/bugs/1683702

Title:
  Cannot upgrade from 16.10 to 17.04

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

Bug description:
  Checking package manager
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Calculating the changes

  Calculating the changes

  Could not determine the upgrade

  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.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: ubuntu-release-upgrader-core 1:16.10.10
  ProcVersionSignature: Ubuntu 4.8.0-46.49-generic 4.8.17
  Uname: Linux 4.8.0-46-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8.2
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Apr 18 10:18:09 2017
  InstallationDate: Installed on 2016-03-13 (400 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160307)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to yakkety on 2017-04-18 (0 days ago)

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