[Bug 1772246] Re: Lubuntu upgrade to 18.04 fails from 16.04 & 17.10

[Nils Fenner]

Hmm… upgrade now went quite smooth. I could not figure out however, what
packages caused the issue here and I haven't found a reference on what
to do actually.

I assume, the main issue is the LXQt 0.10.x installation (the only one
available for 16.04). During the upgrade, the previous LXQt installation
will be completely removed anyway. If you are affected by this issue,
the best advice I can give is: "Logout from the active 16.04/17.10
session and switch to a Terminal (e.g. Ctrl+Alt+F2). Then remove all
lxqt-* packages and upgrade via `sudo do-release-upgrade` from terminal.
Alternatively you can install the good old LXDE session before doing the
upgrade!

Cheers,
Nils

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https://bugs.launchpad.net/bugs/1772246

Title:
  Lubuntu upgrade to 18.04 fails from 16.04 & 17.10

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

Bug description:
  Originally I was upgrading from 16.04 and switched to 17.10 as an
  "interediate step". Both presumingly fail for the same reason. However
  I only have the log from 17.10 available and post this here.

  do-release-upgrade -d

  --- 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 ---

  Hope someone can help and fix it for others as well maybe.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-release-upgrader-core 1:17.10.11
  ProcVersionSignature: Ubuntu 4.13.0-41.46-generic 4.13.16
  Uname: Linux 4.13.0-41-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.8
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sun May 20 13:48:44 2018
  InstallationDate: Installed on 2018-03-06 (75 days ago)
  InstallationMedia: Lubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to artful on 2018-05-20 (0 days ago)
  VarLogDistupgradeTermlog:

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