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

[Nils Fenner]

Walter, thanks for the reply! The issue is still present for my system,
built upon on a stable, yet customized version of Lubuntu 16.04.

> I would suggest filing a new bug, again with `ubuntu-bug ubuntu-
release-upgrader-core`.

Not sure I have done that before I stumbled about this issue here. Will
definitely repeat this step just in case!

Further I dug a bit into the logs and actually found something that
might point to the problem here:

--- from dist-upgrade log ---
…
2018-05-20 13:10:46,069 DEBUG running doUpdate() (showErrors=True)
2018-05-20 13:11:09,777 DEBUG openCache()
2018-05-20 13:11:09,777 DEBUG failed to SystemUnLock() (E:Nicht gesperrt)
2018-05-20 13:11:10,286 DEBUG /openCache(), new cache size 90600
2018-05-20 13:11:10,287 DEBUG need_server_mode(): run in 'desktop' mode, (because of key deps for 'lubuntu-core')
2018-05-20 13:11:11,965 ERROR Dist-upgrade failed: 'E:Fehler: Unterbrechungen durch pkgProblemResolver::Resolve hervorgerufen; dies könnte durch zurückgehaltene Pakete verursacht worden sein.'
2018-05-20 13:11:11,978 DEBUG abort called
2018-05-20 13:11:11,983 DEBUG openCache()
2018-05-20 13:11:11,983 DEBUG failed to SystemUnLock() (E:Nicht gesperrt)
2018-05-20 13:11:13,666 DEBUG /openCache(), new cache size 88071
--- log ends here ---


After filing the bug, I am going to retry the update in 'server' mode or shouldn't I?

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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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