[Bug 1897523] [NEW] 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]

Public bug reported:

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

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "upgrade-logs.tar.gz"
   https://bugs.launchpad.net/bugs/1897523/+attachment/5414880/+files/upgrade-logs.tar.gz

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https://bugs.launchpad.net/bugs/1897523

Title:
  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

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  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

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