[Bug 1588506] Re: 15.10 to 16.04 upgrade failure: "Could not calculate the upgrade"

[agent 8131]

It does not appear to be possible to identify the packages as being held
before the upgrade:

aptitude search ~ahold

nothing

dpkg --get-selections | grep hold

nothing

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https://bugs.launchpad.net/bugs/1588506

Title:
  15.10 to 16.04 upgrade failure: "Could not calculate the upgrade"

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

Bug description:
  There seem to be a lot of these reports. From do-release-upgrade:

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade

  egrep "WARN|ERROR" /var/log/dist-upgrade/main.log

  2016-06-02 11:42:49,437 ERROR Package brscan4 has no priority set
  2016-06-02 11:42:57,958 WARNING Can't mark 'ubuntu-desktop' for upgrade (E:Unable to correct problems, you have held broken packages.)
  2016-06-02 11:42:58,412 WARNING Can't mark 'ubuntu-mate-core' for upgrade (E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.)
  2016-06-02 11:42:58,824 WARNING Can't mark 'ubuntu-mate-desktop' for upgrade (E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.)
  2016-06-02 11:42:58,917 ERROR Dist-upgrade failed: 'The package 'ubuntu-minimal' is marked for removal but it is in the removal blacklist.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-36.42-lowlatency 4.2.8-ckt8
  Uname: Linux 4.2.0-36-lowlatency x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: MATE
  Date: Thu Jun  2 11:37:49 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2011-05-15 (1845 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-06-02 (0 days ago)

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