Public bug reported:

When upgrading a system from eoan to focal, I opened the terminal within
the release upgrader because I like to watch the progress of the package
installations.  To my surprise, a debconf prompt popped up in the
terminal.

update-manager should always be running in a configuration that uses the
gnome frontend, and the release upgrader should be inheriting this
setting.

The libgtk3-perl package is installed.  However, the environment passed
to dpkg shows DEBIAN_FRONTEND=dialog is set instead.

19319 pts/7    Ds+    0:01 /usr/bin/dpkg --force-overwrite --status-fd
58 --no-triggers --unpack --auto-deconfigure --recursive /tmp/apt-dpkg-
install-MhF2Le SHELL=/bin/bash LANG=en_US.UTF-8 LANGUAGE=en
LC_MONETARY=en_US.UTF-8 LC_NUMERIC=en_US.UTF-8 LC_TIME=C.UTF-8 TERM
=xterm-256color COLORTERM=truecolor DISPLAY=:1
XAUTHORITY=/run/user/1000/gdm/Xauthority
PATH=/usr/sbin:/usr/bin:/sbin:/bin LOGNAME=root USER=root HOME=/root
PKEXEC_UID=1000 LC_PAPER=en_US.UTF-8 LC_IDENTIFICATION=en_US.UTF-8
LC_NAME=en_US.UTF-8 LC_ADDRESS=en_US.UTF-8 LC_TELEPHONE=en_US.UTF-8
LC_MEASUREMENT=en_US.UTF-8 RELEASE_UPGRADE_IN_PROGRESS=1
PYCENTRAL_FORCE_OVERWRITE=1 RELEASE_UPGRADE_MODE=desktop
VTE_PTY_KEEP_FD=11 APT_LISTCHANGES_FRONTEND=none DEBIAN_FRONTEND=dialog
VTE_VERSION=5802 DPKG_UNTRANSLATED_MESSAGES=1 DPKG_COLORS=never
DPKG_FRONTEND_LOCKED=true

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: ubuntu-release-upgrader-core 1:19.10.15.4
ProcVersionSignature: Ubuntu 5.3.0-46.38-generic 5.3.18
Uname: Linux 5.3.0-46-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset 
nvidia
ApportVersion: 2.20.11-0ubuntu8.8
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr  7 20:53:19 2020
InstallationDate: Installed on 2019-12-23 (106 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to eoan on 2020-04-08 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Medium
         Status: Triaged

** Affects: ubuntu-release-upgrader (Ubuntu Focal)
     Importance: Medium
         Status: Triaged


** Tags: amd64 apport-bug dist-upgrade eoan third-party-packages

** Also affects: ubuntu-release-upgrader (Ubuntu Focal)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1871530

Title:
  on upgrade from eoan to focal, update-manager puts debconf prompts to
  the terminal instead of using the gnome frontend

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