[Bug 1551623] Re: [SRU] package gconf2 3.2.6-3ubuntu6 failed to install/upgrade: dependency problems - leaving triggers unprocessed

[Ori Avtalion]

I'm seeing the "Could not install 'gconf2'" error during upgrade from
19.10 to the 20.04 beta.

The crash reports says the error is "dependency problems - leaving
triggers unprocessed"

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Title:
  [SRU] package gconf2 3.2.6-3ubuntu6 failed to install/upgrade:
  dependency problems - leaving triggers unprocessed

Status in gconf package in Ubuntu:
  Triaged

Bug description:
  [Impact]

  During system upgrades, triggers for gconf2 might activate too early,
  while some of its dependencies aren't configured yet. This happens
  several times in a loop and stops the upgrade in the end.

  The attached debdiffs fix this issue by changing interest to interest-
  noawait in debian/gconf2.triggers file. The triggers will now activate
  near the end of upgrade.

  In addition, the debdiff for Bionic also contains a fix for FTBFS (bug
  1834211).

  [Test Case]

  Triggers for gconf2 are usually activated on changes in
  /usr/share/GConf/gsettings folder, so the main Ubuntu edition (with
  GNOME) is most suitable for reproducing the issue. To reproduce it,
  install that edition, apply all updates, then try upgrading to the
  next release.

  [Regression Potential]

  None, interest-noawait trigger is known to work well in other packages
  (comment 31).

  [Other Info]

  Even if Cosmic goes EOL next month, the fix for it might be worth it
  for release upgrades.

  [Original Description]

  When upgrading from 15.10 to 16.04Beta (2016-03-01), this error occured, alongside many others related to systemd and gnome.
  Notice that despite all warnings and errors, finally, the system remained functional.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: gconf2 3.2.6-3ubuntu6
  ProcVersionSignature: Ubuntu 4.4.0-8.23-generic 4.4.2
  Uname: Linux 4.4.0-8-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  Date: Tue Mar  1 09:21:15 2016
  ErrorMessage: dependency problems - leaving triggers unprocessed
  InstallationDate: Installed on 2015-10-04 (148 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20151002)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1
   apt  1.2.3
  SourcePackage: gconf
  Title: package gconf2 3.2.6-3ubuntu6 failed to install/upgrade: dependency problems - leaving triggers unprocessed
  UpgradeStatus: Upgraded to xenial on 2016-03-01 (0 days ago)

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