do-release-upgrade of 18.04 LTS -> 18.10 failed due to gconf2

[Marius Gedminas]

I was upgrading my laptop from 18.04 LTS to 18.10 with

    apt update
    apt upgrade
    do-release-upgrade

and it failed, due to

     dpkg: dependency problems prevent processing triggers for gconf2:
      gconf2 priklauso nuo psmisc; tačiau:
       Paketas psmisc dar nekonfigūruotas.

     dpkg: klaida, apdorojant paketą gconf2 (--configure):
      dependency problems - leaving triggers unprocessed

in a loop until dpkg gave up.

Could this be another instance of bug 1780996?

(I'm not sure why I even had gconf2 installed. No apps depend on it. Might be some build dependency pulled it in a while ago -- I was building gvim from source on this machine since before it was ported to GTK+ 3.)

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: ubuntu-release-upgrader-core 1:18.10.11
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Thu Oct 18 23:20:31 2018
InstallationDate: Installed on 2016-09-10 (768 days ago)
InstallationMedia: Ubuntu-GNOME 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160720)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to cosmic on 2018-10-18 (0 days ago)