[Bug 1573680] [NEW] xubuntu update 15.10 to 16.04: Could not calculate the upgrade

[Sylvain]

Public bug reported:

my laptop has two disks with xubuntu 15.10 on each, both run into that
error.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.4
ProcVersionSignature: Ubuntu 4.2.0-36.41-generic 4.2.8-ckt8
Uname: Linux 4.2.0-36-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
Date: Fri Apr 22 17:45:42 2016
InstallationDate: Installed on 2015-12-28 (116 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to wily on 2016-04-22 (0 days ago)

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


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

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https://bugs.launchpad.net/bugs/1573680

Title:
  xubuntu update 15.10 to 16.04: Could not calculate the upgrade

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

Bug description:
  my laptop has two disks with xubuntu 15.10 on each, both run into that
  error.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-36.41-generic 4.2.8-ckt8
  Uname: Linux 4.2.0-36-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri Apr 22 17:45:42 2016
  InstallationDate: Installed on 2015-12-28 (116 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-04-22 (0 days ago)

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