[Bug 1774695] Re: Could not calculate the upgrade

[Brian Murray]

This is due to the fact that you have installed some packages from the
Ubuntu toolchain PPA and they provide a greater version of the package
than the one in Ubuntu 18.04, the release to which you are trying to
upgrade. Please use the tool ppa-purge to remove that PPA and downgrade
to the official versions of the package and try the upgrade again.

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

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https://bugs.launchpad.net/bugs/1774695

Title:
  Could not calculate the upgrade

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

Bug description:
  Software Updater:
  Ubuntu Studio 18.04 LTS is now available (you have 17.10)

  
  1.) Ubuntu 17.10

  2.) apt-cache policy pkgname:
  N: Unable to locate package pkgname

  3.) Distribution Upgrade: Upgrading Ubuntu to version 18.04

  4.) Could not calculate the upgrade

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-release-upgrader-core 1:17.10.11
  ProcVersionSignature: Ubuntu 4.13.0-45.50-lowlatency 4.13.16
  Uname: Linux 4.13.0-45-lowlatency x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3.9
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Fri Jun  1 21:14:49 2018
  InstallationDate: Installed on 2016-10-23 (586 days ago)
  InstallationMedia: Ubuntu-Studio 16.10 "Yakkety Yak" - Release amd64 (20161012.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to artful on 2018-06-01 (0 days ago)
  VarLogDistupgradeTermlog:

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