Got the same issue. Is there any chance to solve this issue / bug?
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https://bugs.launchpad.net/bugs/1897523
Title:
upgrade bug from 18.04 to 20.04; dpkg: error processing package ssmtp
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