[Bug 1708373] Re: upgrade from 16.04 to 17.04 failed "Could not calculate the upgrade"

[Ubuntu Foundations Team Bug Bot]

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

Reviewing the files from your upgrade attempt you seem to have enabled a
PPA that provides Xorg packages. This will prevent the upgrade as that
PPA contains different versions of packages essential to Ubuntu. The
page, https://launchpad.net/~xorg-edgers/+archive/ppa, contains details
on to how to revert to the official Xorg packages for the xorg-edgers
PPA.  Instructions for reverting to official Xorg packages should be
similar for the PPA that you have enabled. Thanks.

[This is an automated message.  I apologize if it reached you
inappropriately; please just reply to this message indicating so.]

** Tags added: xenial2zesty

** Tags added: ppa

** Tags added: xorg-edgers-ppa

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

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ubuntu-release-upgrader in
Ubuntu.
https://bugs.launchpad.net/bugs/1708373

Title:
  upgrade from 16.04 to 17.04 failed "Could not calculate the upgrade"

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

Bug description:
  Running 16.04, trying to upgrade to 17.04. Error during the second step "Setting new software channels". Error dialog says:
  ```
  Could not calculate 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.
  ```
  No idea what could cause this...

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.22
  ProcVersionSignature: Ubuntu 4.4.0-87.110-generic 4.4.73
  Uname: Linux 4.4.0-87-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Thu Aug  3 09:11:34 2017
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-07-11 (387 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2017-08-03 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update-manager.release-upgrades: 2017-08-03T09:04:42.657655

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1708373/+subscriptions