[Bug 1774695] [NEW] Could not calculate the upgrade

[Fille Mazendacus]

Public bug reported:

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:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful dist-upgrade

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

Title:
  Could not calculate the upgrade

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

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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