[Bug 1787979] Re: cannot upgrade from 16.04 to 18.04

[Brian Murray]

Thank you for taking the time to report this bug and helping to make
Ubuntu better. The error that you are a reporting is a package conflict
between a package from the official Ubuntu archive and a package from
the ubuntu-toolchain-r test PPA. To resolve this situation please
uninstall the packages from that PPA using the tool 'ppa-purge' which is
provided by the ppa-purge package. Then try performing the distribution
upgrade operations again. Thanks in advance!

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

** Tags added: ppa-conflict ubuntu-toolchain-r

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https://bugs.launchpad.net/bugs/1787979

Title:
  cannot upgrade from 16.04 to 18.04

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

Bug description:
  Trying to upgrade 16.04.5 LTS to 18.04.1 LTS we get an error without
  any explanation:

  (system is up to date, nothing to do in an apt update/dist-upgrade,
  and freshly rebooted)

  Reporting here with ubuntu-bug as advised by the error message

  
  Reading cache

  Checking package manager
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Hit http://fr.archive.ubuntu.com/ubuntu xenial InRelease
  Hit http://fr.archive.ubuntu.com/ubuntu xenial-updates InRelease
  Hit http://fr.archive.ubuntu.com/ubuntu xenial-backports InRelease
  Hit http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial InRelease
  Hit http://security.ubuntu.com/ubuntu xenial-security InRelease
  Hit http://archive.canonical.com/ubuntu xenial InRelease
  Fetched 0 B in 0s (0 B/s)
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done

  Updating repository information

  Third party sources disabled

  Some third party entries in your sources.list were disabled. You can
  re-enable them after the upgrade with the 'software-properties' tool
  or your package manager.

  To continue please press [ENTER]

  Hit http://fr.archive.ubuntu.com/ubuntu bionic InRelease
  Hit http://fr.archive.ubuntu.com/ubuntu bionic-updates InRelease
  Hit http://fr.archive.ubuntu.com/ubuntu bionic-backports InRelease
  Hit http://security.ubuntu.com/ubuntu bionic-security InRelease
  Hit http://archive.canonical.com/ubuntu bionic InRelease
  Fetched 0 B in 0s (0 B/s)

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

  Calculating the changes

  Calculating the changes

  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.

  
  Restoring original system state

  Aborting
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  === Command terminated with exit status 1 (Mon Aug 20 17:45:23 2018) ===

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-133.159-generic 4.4.134
  Uname: Linux 4.4.0-133-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  Date: Mon Aug 20 17:37:15 2018
  PackageArchitecture: all
  ProcEnviron:
   LD_LIBRARY_PATH=<set>
   TERM=xterm
   PATH=(custom, no user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-20 (0 days ago)

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