[Bug 1684198] Re: do-release-upgrade fails due to "An unresolvable problem occurred while calculating the upgrade."

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1684198

Title:
  do-release-upgrade fails due to "An unresolvable problem occurred
  while calculating the upgrade."

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

Bug description:
  All invokations of `sudo do-release-upgrade` fail due to `An
  unresolvable problem occurred while calculating the upgrade.` after a
  previous run has been aborted with Ctrl+C. The output is:

  ```
  Hit http://de.archive.ubuntu.com/ubuntu zesty-backports InRelease
  Get:3 http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Debian_8.0  Release.gpg [481 B]
  Ign http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Debian_8.0  Release.gpg
  Fetched 90,7 kB in 0s (0 B/s)
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done

  Updating repository information

  Third party sources disabled

  Some third party entries in your sources.list were disabled. You can
  re-enable them after the upgrade with the 'software-properties' tool
  or your package manager.

  To continue please press [ENTER]

  Hit http://de.archive.ubuntu.com/ubuntu zesty InRelease
  Get:1 http://security.ubuntu.com/ubuntu zesty-security InRelease [89,2 kB]
  Hit http://de.archive.ubuntu.com/ubuntu zesty-updates InRelease
  Hit http://de.archive.ubuntu.com/ubuntu zesty-backports InRelease
  Fetched 89,2 kB in 0s (0 B/s)

  Checking package manager
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done

  Calculating the changes

  Calculating the changes

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This can be caused by:
  * Upgrading to a pre-release version of Ubuntu
  * Running the current pre-release version of Ubuntu
  * Unofficial software packages not provided by Ubuntu

  If none of this applies, then please report this bug using the
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

  Restoring original system state

  Aborting
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  ```

  The release in `sources.list` have been altered and the release
  upgrade should:

    * explain what's going on - why give a list of possible reasons if checking these reasons programmatically is absolutely possible -> apply principles of "Don't make me think" design
    * not say that it restores the original system state without making sure that it actually does that because it does _not_
    * restore the system state reliably, e.g. detect a mismatch between `lsb_release` output and release in `sources.list` (in doubt ask the user for input)
    * warn about potentially unwanted changes of crucial system configuration when pressing Ctrl+C and add require the user to press it a second time/send SIGINT twice
    * after more than 20 version upgrades over more than 10 years just work perfectly better sooner than later

  Not a duplicate of https://bugs.launchpad.net/ubuntu/+source/ubuntu-
  release-upgrader/+bug/1246441 because I'm not using the Xorg edgers
  PPA and the necessary improvements would still be necessary.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: ubuntu-release-upgrader-core 1:16.10.10
  ProcVersionSignature: Ubuntu 4.8.0-46.49-generic 4.8.17
  Uname: Linux 4.8.0-46-generic x86_64
  NonfreeKernelModules: zfs zunicode icp zcommon znvpair zavl
  ApportVersion: 2.20.3-0ubuntu8.2
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Apr 19 16:51:42 2017
  InstallationDate: Installed on 2015-12-12 (494 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to yakkety on 2017-04-19 (0 days ago)

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