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libgtk2-perl is obsolete and no longer installed by default on the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
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