[Bug 1769184] Re: I can't seem to upgrade to Ubuntu 18.04 from 17.10. It can't calculate changes.

[Walter Lapchynski]

>From what I'm understanding here, the OP, Rob, resolved his issue, which
centered around Ubuntu Desktop, so for all intents and purposes, this
bug should be considered invalid, given those particular requirements.

The other affected party, Nils, seems to be dealing with Lubuntu. I
cannot reproduce this issue. Using a fresh VM, for both Artful and
Xenial, I installed and let it upgrade like normal. Then I upgraded¹. No
problems.

That said, for Lubuntu, I can only conclude that something about your
system is inconsistent with a standard system. One thing to note here is
that at no point has LXQt been included as part of an official Lubuntu
release. That could potentially lead to the issues you're facing.
Perhaps we could investigate further, but not without additional
information. I would suggest filing a new bug, again with `ubuntu-bug
ubuntu-release-upgrader-core`. Hopefully it's not too late that we can't
get any useful information from it.

¹ Until the first point release, LTS→LTS is not supported through
ubuntu-release-upgrader, but requires using `do-release-upgrade -d`.

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

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https://bugs.launchpad.net/bugs/1769184

Title:
  I can't seem to upgrade to Ubuntu 18.04 from 17.10.  It can't
  calculate changes.

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

Bug description:
  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. 

  I disabled all repos except canonical.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-release-upgrader-core 1:17.10.10
  ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13
  Uname: Linux 4.13.0-36-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Fri May  4 08:17:22 2018
  InstallationDate: Installed on 2017-04-21 (378 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to artful on 2018-05-04 (0 days ago)

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