Comment 6 for bug 1343737

More background information:

I am upgrading from bionic to cosmic.

The process hierarchy is, starting with PID 1 and following the chain down to the editor process:

/lib/systemd/systemd --system --deserialize 22
/usr/bin/python3 /tmp/ubuntu-release-upgrader-11yhdo4c/cosmic --mode=server --frontend=DistUpgradeViewText
/usr/bin/dpkg --force-overwrite --statud-fd 122 --configure --pending
/usr/bin/perl -w /usr/share/debconf/frontend /var/lib/dpkg/info/unattended-upgrades.postinst configure 1.1ubuntu1.18.04.11
/bin/sh /&var/lib/dpkg/info/unattended-upgrades.postinst configure 1.1ubuntu1.18.04.11
/bin/bash /usr/bin/ucf --three-way --debconf-ok /etc/apt/apd.conf.d/50unattended-uptrades.ucftmp /etc/apt/apt.conf.d/50unattended-upgrades
bash
joe 50unattended-upgrades 50unattended-upgrades~ 50unattended-upgrades.merge-error 50unattended-upgrades.ucf-dist 50unattended-upgrades.ucftmp

I had to type the commands manually, so typos are possible (and likely).

Continuing... fingers crossed...