[Bug 1816802] Re: Upgrade to Bionic from Xenial is not completing

[John Troll]

*** This bug is a duplicate of bug 1611737 ***
    https://bugs.launchpad.net/bugs/1611737

So does this mean that for some people with ROS, they must uninstall ROS
in order to upgrade Ubuntu?

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https://bugs.launchpad.net/bugs/1816802

Title:
  Upgrade to Bionic from Xenial is not completing

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

Bug description:
  I am unable to update from 16.04 to 18.04, getting the "Could not
  calculate the upgrade" error. and have attempted to remove all
  launchpad related PPAs.  I am running Ubuntu 16.04 LTS.

  Not sure if this is related to a CUDA install I tried to do some time
  ago that never really worked.

  Full Error:

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

   This was likely caused by:
   * Unofficial software packages not provided by Ubuntu
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again.

  If none of this applies, then please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.If you want to
  investigate this yourself the log files in '/var/log/dist-upgrade'
  will contain details about the upgrade. Specifically, look at
  'main.log' and 'apt.log'.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  ProcVersionSignature: Ubuntu 4.15.0-45.48~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-45-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Feb 20 11:02:39 2019
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2018-04-03 (323 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-02-20 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update-manager.release-upgrades: 2019-02-20T08:58:57.640892

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