[Bug 1611256] Re: X to Y upgrade fails with gconf2 depends on python3:any; however: Package python3 is not configured yet.

[Brian Murray]

I tested an upgrade from Ubuntu 16.04 to Ubuntu 18.04 today with the
packages gconf2, gparted, preload among others installed. The upgrade
completed successfully and there were no issues with triggers looping. I
believe this is the result of a new version of dpkg which is available
in Ubuntu 16.04.

dpkg (1.18.4ubuntu1.6) xenial; urgency=medium

  * Cherry-pick upstream fixes for trigger loops (LP: #1828639)
    - dpkg: Negate tortoise_not_in_hare() function name and return value
    - dpkg: Initialize trigcyclenode's next member once
    - dpkg: Factor trigproc_new_cyclenode() out from check_trigger_cycle()
    - dpkg: Mark the package we are giving up on a trigger cycle as istobe normal
    - dpkg: Switch dependtry from an int to an enum
    - dpkg: Reset progress_bytrigproc once we have injected into the current iteration
    - dpkg: Split trigger processing types into required, try-queued and try-deferred
    - dpkg: Convert one trigger processing required type into the new try-queued
    - dpkg: Move trigproc cycle reset inside try-deferred conditional
    - dpkg: Introduce a new dependency try level for trigger processing
    - dpkg: Introduce a new dependency try level for trigger cycle checks

 -- Julian Andres Klode <juliank at ubuntu.com>  Tue, 16 Jul 2019 14:57:11
+0200

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https://bugs.launchpad.net/bugs/1611256

Title:
  X to Y upgrade fails with gconf2 depends on python3:any; however:
  Package python3 is not configured yet.

Status in gconf2 package in Ubuntu:
  Confirmed
Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  Enviroment: Ubuntu 16.04 Xenial http://cdimage.ubuntu.com/daily-
  live/current/

  HW: Toshiba portege Z30-A12T | Intel i5+intel graphics | SSD hd

  Preconditions: Xenial xerus updated, internet connection, some
  packages installed(gparted,preload)

  Steps to reproduce:

  1º Open terminal and run update-manager -cd
  2º Then packages start to fail and report the user that X package can't be installed and it could be not functional, however the upgrading process continues

  Current result: Many packages fail during upgrading process from
  xenial to yakketty

  Expected result: No package failures during installation

  Add info: screenshot attached as example of package failure

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: ubuntu-release-upgrader-core 1:16.10.3
  ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
  Uname: Linux 4.4.0-34-generic x86_64
  ApportVersion: 2.20.3-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Aug  9 09:40:07 2016
  InstallationDate: Installed on 2016-08-09 (0 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Beta amd64 (20160806)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to yakkety on 2016-08-09 (0 days ago)
  VarLogDistupgradeTermlog:

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