Seem fixed by:
courier-authlib (0.66.4-3) unstable; urgency=medium
* Check and create courier user in authdaemon package in case
courier-base is not installed first (LP#1542174)
-- Ondřej Surý Fri, 05 Feb 2016 09:58:26 +0100
But a question still remains there:
Why
More details:
#
root@xenial:/usr/local/src/imscp# LANG=C aptitude install courier-authdaemon
The following NEW packages will be installed:
courier-authdaemon
0 packages upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need
@ Ondřej Surý
Loving when you push changes without any test... You should be killed.
courier-authlib (0.66.4-2) unstable; urgency=medium
* Convert the d/copyright into machine-readable file and add license for
authldaplib.c
* Use invoke-rc.d to restart authdaemon on mysql and postgresql