[Bug 1890538] Re: Cannot upgrade

[Chris Guiver]

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

** This bug has been marked a duplicate of bug 1611737
   Can't upgrade from a release if ros packages are  installed from ROS servers

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https://bugs.launchpad.net/bugs/1890538

Title:
  Cannot upgrade

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

Bug description:
  Unable to upgrade from Ubuntu 16.04 LTS to 18.04.4 LTS.

  The following error is given:
  "

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

   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'.

  "

  I have tried to remove the ppa with ppa-purge and manually through the
  settings gui. They remove but then come back.

  Please help me upgrade to 18.04.4.

  I also have ROS and GNU Radio installed I am using a Nvidia Jetson TX2
  .

  Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.30
  Uname: Linux 4.4.38-tegra aarch64
  ApportVersion: 2.20.1-0ubuntu2.24
  Architecture: arm64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Aug  6 14:08:47 2020
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2020-08-06 (0 days ago)
  VarLogDistupgradeLspcitxt:
   
  VarLogDistupgradeTermlog:

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