Hi, here is an error that I had to show to the package maintainer 
Achille:/usr/share/zabbix# dpkg-reconfigure zabbix-frontend-php
dbconfig-common: writing config to /etc/dbconfig-common/zabbix-frontend-php.conf
*** WARNING: ucf was run from a maintainer script that uses debconf, but
the script did not pass --debconf-ok to ucf. The maintainer
script should be fixed to not stop debconf before calling ucf,
and pass it this parameter. For now, ucf will revert to using
old-style, non-debconf prompting. Ugh!
Please inform the package maintainer about this problem.
sophocle:/usr/share/zabbix#

Achille:/usr/share/zabbix# dpkg-reconfigure zabbix-frontend-php
dbconfig-common: writing config to /etc/dbconfig-common/zabbix-frontend-php.conf
*** WARNING: ucf was run from a maintainer script that uses debconf, but
the script did not pass --debconf-ok to ucf. The maintainer
script should be fixed to not stop debconf before calling ucf,
and pass it this parameter. For now, ucf will revert to using
old-style, non-debconf prompting. Ugh!
Please inform the package maintainer about this problem.
sophocle:/usr/share/zabbix#
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