Could not install 'gconf2' and upgrade frozen

Bug #1710383 reported by Donald Pellegrino on 2017-08-12
This bug affects 1 person
Affects Status Importance Assigned to Milestone
ubuntu-release-upgrader (Ubuntu)

Bug Description

When performing a distribution upgrade from Ubuntu 16.04.3 xenial to 17.04, a dialog is generated with the following messages:

Could not install 'gconf2'
The upgrade will continue but the 'gconf2' package may not be in a working state. Please consider submitting a bug report about it.
dependency problems - leaving triggers unprocessed

The dialog has a Close button. Clicking it closes the dialog but it then reappears again immediately. It is stuck in a loop.

The distribution upgrade dialog continues in the background for a while. However, it then freeze having last reported "Configuring libpam-systemd (amd64)" in the "Installing the upgrades" step.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-software 3.20.5-0ubuntu0.16.04.5
ProcVersionSignature: Ubuntu 4.4.0-91.114-generic 4.4.76
Uname: Linux 4.4.0-91-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat Aug 12 10:54:28 2017
EcryptfsInUse: Yes
 PATH=(custom, no user)
SourcePackage: gnome-software
UpgradeStatus: Upgraded to xenial on 2017-08-12 (0 days ago)

This is a critical bug. It led to a path requiring a clean install of Ubuntu and a restore of user data from backups. The upgrade was ultimately unrecoverable even when booting to a Live USB stick to continue the upgrade.

affects: gnome-software (Ubuntu) → ubuntu-release-upgrader (Ubuntu)
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