[Bug 1823987] Re: upgrade to 18.04 fails.

[Brian Murray]

It's the ubuntu-toolchain-r PPA which is probably causing your issue.

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https://bugs.launchpad.net/bugs/1823987

Title:
  upgrade to 18.04 fails.

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

Bug description:
  I am trying to upgrade my ubuntu 16.04 to 18.04 and it is failing. It
  is asking me to remove third party ppa packages but I don't know how
  to find them and remove them.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  ProcVersionSignature: Ubuntu 4.4.0-145.171-generic 4.4.176
  Uname: Linux 4.4.0-145-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Apr  9 21:07:16 2019
  InstallationDate: Installed on 2016-08-23 (959 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-04-09 (0 days ago)
  VarLogDistupgradeTermlog:

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