upgrade bug from 18.04 to 20.04; dpkg: error processing package ssmtp (--configure): installed ssmtp package post-installation script subprocess returned error exit status 2

[Maksim Yu.Semenov]

error during 'do-release-upgrade -d'
======================
[...]
Progress: [ 99%]
Processing triggers for libgdk-pixbuf2.0-0:amd64 (2.40.0+dfsg-3) ...
Processing triggers for dbus (1.12.16-2ubuntu2.1) ...
Processing triggers for libapache2-mod-php7.4 (7.4.3-4ubuntu2.2) ...
Errors were encountered while processing:
 ssmtp
Exception during pm.DoInstall(): E:Sub-process /usr/bin/dpkg returned an error code (1)

Could not install the upgrades

The upgrade has aborted. Your system could be in an unusable state. A
recovery will run now (dpkg --configure -a).

Please report this bug in a browser at
http://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+filebug
and attach the files in /var/log/dist-upgrade/ to the bug report.
E:Sub-process /usr/bin/dpkg returned an error code (1)

Setting up ssmtp (2.64-8.1ubuntu1) ...
/var/lib/dpkg/info/ssmtp.config: 11: export: #адрес: bad variable name
dpkg: error processing package ssmtp (--configure):
 installed ssmtp package post-installation script subprocess returned error exit status 2
Errors were encountered while processing:
 ssmtp

Upgrade complete

The upgrade has completed but there were errors during the upgrade
process.

To continue please press [ENTER]
===========================================

However 'lsb_release -a' output
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal

[Brian Murray (brian-murray)]

The file /var/lib/dpkg/info/ssmtp.config contains the following lines:

if [ -f /etc/ssmtp/ssmtp.conf ]
then
        for v in `grep -E "^(root|mailhub|rewriteDomain|hostname|FromLineOverride)=" /etc/ssmtp/ssmtp.conf`
        do
                export $v
        done

So it was reading your /etc/ssmtp/ssmtp.conf and found something that could not be exported.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Dominik Müller (muellerdo)]

Got the same issue. Is there any chance to solve this issue / bug?

[Dominik Müller (muellerdo)]

Here is my /var/lib/dpkg/info/ssmtp.config file.

set -e

. /usr/share/debconf/confmodule

if [ -f /etc/ssmtp/ssmtp.conf ]
then
        for v in `grep -E "^(root|mailhub|rewriteDomain|hostname|FromLineOverride)=" /etc/ssmtp/ssmtp.conf`
        do
                export $v
        done

        db_set ssmtp/root "$root"
        if [ -n "$mailhub" ]
        then
                if [ `expr index "$mailhub" :` -ne 0 ]
                then
                        db_set ssmtp/port "${mailhub#*:}"
                        db_set ssmtp/mailhub "${mailhub%:*}"
                else
                        db_set ssmtp/port 25
                        db_set ssmtp/mailhub "$mailhub"
                fi
        fi
        if [ -n "$rewriteDomain" ]
        then
                db_set ssmtp/rewritedomain "$rewriteDomain"
        fi
        if [ -n "$hostname" ]
        then
                db_set ssmtp/hostname "$hostname"
        fi
        if [ -n "$FromLineOverride" ]
        then
                if [ "$FromLineOverride" = "YES" ]
                then
                        db_set ssmtp/fromoverride true
                else
                        db_set ssmtp/fromoverride false
                fi
        fi
fi

db_input medium ssmtp/root || true
db_go

db_input medium ssmtp/mailhub || true
db_go

db_input low ssmtp/port || true
db_go

db_input medium ssmtp/rewritedomain || true
db_go

db_input low ssmtp/hostname || true
db_go

db_input medium ssmtp/fromoverride || true
db_go

# Program End
exit 0