[Bug 1769608] Re: i was upgrading from ubuntu 17.1 to 18, one machine was upgraded, but another (this) machine is not upgrading

[Jean-Baptiste Lallement]

*** This bug is a duplicate of bug 1768620 ***
    https://bugs.launchpad.net/bugs/1768620

Thanks for your report.

Unlike what dino99 said, this is not a duplicate but caused by the xorg
stack installed from the oibaf PPA. Please revert to official version of
these package and try to upgrade again.

Don't hesitate to file any bug you may find.

** This bug is no longer a duplicate of bug 1768620
   removal_blacklist.cfg updates

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

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https://bugs.launchpad.net/bugs/1769608

Title:
  i was upgrading from ubuntu 17.1 to 18, one machine was upgraded, but
  another (this) machine is not upgrading

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

Bug description:
  i was upgrading from ubuntu 17.10 to 18, one machine was upgraded
  successfully, but another (this) machine is not upgrading it 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

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-release-upgrader-core 1:17.10.11
  ProcVersionSignature: Ubuntu 4.13.0-39.44-generic 4.13.16
  Uname: Linux 4.13.0-39-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.8
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon May  7 15:10:37 2018
  InstallationDate: Installed on 2018-03-16 (52 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to artful on 2018-05-07 (0 days ago)
  VarLogDistupgradeTermlog:

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