[Bug 1871530] Re: on upgrade from eoan to focal, update-manager puts debconf prompts to the terminal instead of using the gnome frontend

[Steve Langasek]

Found in ./DistUpgradeViewGtk3.py:

        # if no libgtk2-perl is installed show the terminal
        frontend= os.environ.get("DEBIAN_FRONTEND") or "gnome"
        if frontend == "gnome" and self._cache:
            if (not "libgtk2-perl" in self._cache or
                not self._cache["libgtk2-perl"].is_installed):
                frontend = "dialog"
                self.expander.set_expanded(True)
        self.env = ["VTE_PTY_KEEP_FD=%s"% self.writefd,
                    "APT_LISTCHANGES_FRONTEND=none"]
        if "DEBIAN_FRONTEND" not in os.environ:
            self.env.append("DEBIAN_FRONTEND=%s" % frontend)

libgtk2-perl is obsolete and no longer installed by default on the
desktop.  This needs updated for libgtk3-perl.

** Changed in: ubuntu-release-upgrader (Ubuntu Focal)
   Importance: Undecided => Medium

** Changed in: ubuntu-release-upgrader (Ubuntu Focal)
       Status: New => Triaged

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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

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged
Status in ubuntu-release-upgrader source package in Focal:
  Triaged

Bug description:
  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:

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