[Bug 1782512] Re: could not calculate upgrade bug from 16.04 to 18.04

[Brian Murray]

It is not enough to just disable the PPA, you need to use the tool 'ppa-
purge' from the package ppa-purge to also downgrade the versions of the
package provided by the PPA to the official versions of the Ubuntu
package. This PPA is certainly causing the failure to calculate the
upgrade although there may be others.

https://launchpad.net/~ubuntu-
toolchain-r/+archive/ubuntu/test?field.series_filter=xenial

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

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https://bugs.launchpad.net/bugs/1782512

Title:
  could not calculate upgrade bug from 16.04 to 18.04

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

Bug description:
  I have tried disabling all ppa's except canonical,but doesn't help

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-130.156-generic 4.4.134
  Uname: Linux 4.4.0-130-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Jul 19 10:55:23 2018
  InstallationDate: Installed on 2016-09-26 (660 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-07-19 (0 days ago)
  VarLogDistupgradeTermlog:

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