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

[agent 8131]

I'd suggest that given the large number of similar reports, probably all
with different packages at fault, the actual bug is more correctly that
the upgrade tools do not report the name of the problem packages.

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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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