[Bug 1803318] Re: Upgrade to 18.04 fails from 16.04

[robbah]

I used Y-PPA-Manager to purge all the PPAs. This is a GUI tool.

The Y-PPA-Manager tool can be easily installed using the “WebUpd8” team
PPA as shown.

$ sudo add-apt-repository ppa:webupd8team/y-ppa-manager
$ sudo apt update
$ sudo apt install y-ppa-manager

After successfully installing y-ppa-manager, i launch it from the
terminal as follow.

$ y-ppa-manager

I also purged the PPA of the Y-PPA-Manager ofcourse. After doing this,
the upgrade went smoothly.

Maybe it is an idea to create an update for 16.04 where this is
automatically done in the upgrade? (and with a notification)

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https://bugs.launchpad.net/bugs/1803318

Title:
  Upgrade to 18.04 fails from 16.04

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

Bug description:
  I receive this error when i want to upgrade with he software updater
  GUI. i also receive this error when upgrading using the terminal.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-39.42~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-39-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Nov 14 11:18:26 2018
  InstallationDate: Installed on 2018-02-08 (278 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-11-14 (0 days ago)
  VarLogDistupgradeTermlog:

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