avoids this warnig:

*** 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.

this avoids endless loops during configuration

this avoids endless loops during configuration

this prevented dpkg-reconfigure from working with debconf level set to
high or critical