Bug#919902: exim4-config: fails to upgrade from 'stretch': option "hosts_try_dane" unknown

[Andreas Beckmann]

Package: exim4-config
Version: 4.92~RC4-2
Severity: serious
User: debian-qa at lists.debian.org
Usertags: piuparts
Control: affects -1 + exim4-daemon-light

Hi,

during a test with piuparts I noticed your package fails to upgrade from
'stretch'.
It installed fine in 'stretch', then the upgrade to 'buster' fails.

>From the attached log (scroll to the bottom...):

  Setting up exim4-config (4.92~RC4-2) ...
  Installing new version of config file /etc/exim4/conf.d/acl/30_exim4-config_check_rcpt ...
  Installing new version of config file /etc/exim4/conf.d/acl/40_exim4-config_check_data ...
  Installing new version of config file /etc/exim4/conf.d/main/01_exim4-config_listmacrosdefs ...
  Installing new version of config file /etc/exim4/conf.d/main/02_exim4-config_options ...
  Installing new version of config file /etc/exim4/conf.d/router/200_exim4-config_primary ...
  Installing new version of config file /etc/exim4/conf.d/transport/30_exim4-config_remote_smtp ...
  Installing new version of config file /etc/exim4/conf.d/transport/30_exim4-config_remote_smtp_smarthost ...
  Installing new version of config file /etc/exim4/exim4.conf.template ...
  2019-01-18 08:14:02 Exim configuration error in line 833 of /var/lib/exim4/config.autogenerated.tmp:
    option "hosts_try_dane" unknown
  Invalid new configfile /var/lib/exim4/config.autogenerated.tmp, not installing 
  /var/lib/exim4/config.autogenerated.tmp to /var/lib/exim4/config.autogenerated
  dpkg: error processing package exim4-config (--configure):
   subprocess installed post-installation script returned error exit status 1


cheers,

Andreas
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