[Bug 1826725] [NEW] Cant update to 19.04 Cant calculate update

[Onosenday]

Public bug reported:

The update  with do-release-upgrade fails with error:

An unresolvable problem occurred while calculating the upgrade.

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
you want to investigate this yourself the log files in 
'/var/log/dist-upgrade' will contain details about the upgrade. 
Specifically, look at 'main.log' and 'apt.log'.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: ubuntu-release-upgrader-core 1:18.10.11.6
ProcVersionSignature: Ubuntu 4.18.0-18.19-generic 4.18.20
Uname: Linux 4.18.0-18-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.10-0ubuntu13.3
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Sun Apr 28 12:48:54 2019
InstallationDate: Installed on 2018-04-18 (374 days ago)
InstallationMedia: Ubuntu-MATE 17.10 "Artful Aardvark" - Release amd64 (20180106)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to cosmic on 2019-04-28 (0 days ago)

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


** Tags: amd64 apport-bug cosmic dist-upgrade third-party-packages

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https://bugs.launchpad.net/bugs/1826725

Title:
  Cant update to 19.04 Cant calculate update

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

Bug description:
  The update  with do-release-upgrade fails with error:

  An unresolvable problem occurred while calculating the upgrade.

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: ubuntu-release-upgrader-core 1:18.10.11.6
  ProcVersionSignature: Ubuntu 4.18.0-18.19-generic 4.18.20
  Uname: Linux 4.18.0-18-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.10-0ubuntu13.3
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Sun Apr 28 12:48:54 2019
  InstallationDate: Installed on 2018-04-18 (374 days ago)
  InstallationMedia: Ubuntu-MATE 17.10 "Artful Aardvark" - Release amd64 (20180106)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to cosmic on 2019-04-28 (0 days ago)

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