ser2net (4.3.2-1) unstable; urgency=medium

  ser2net > 4 has a new configuration file concept in YAML. It still can
  read the old configuration format. The package delivers a YAML 
  configuration file, which will reset the configuration to package defaults.

  You can point CONFFILE back to /etc/ser2net.conf in /etc/default/ser2net
  to get your old configuration back until you have found the time to
  convert your configuration to YAML.

  The ability to read old-format configuration files will go away
  at some time in the future.

  After converting your configuration to YAML, ser2net.conf can be removed.

 -- Marc Haber <mh+debian-packages@zugschlus.de>  Thu, 04 Feb 2021 08:37:44 +0100