So I was installing Kolab over an OpenVZ Debian 7 Minimal image on Proxmox, and half the install I find this error:

Stopping MySQL database server: mysqld.
/var/lib/dpkg/info/mysql-server-5.5.postinst: line 146: logger: command not found
ATTENTION: An error has occured. More info is in the syslog!
/var/lib/dpkg/info/mysql-server-5.5.postinst: line 236: logger: command not found
dpkg: error processing mysql-server-5.5 (--configure):
 subprocess installed post-installation script returned error exit status 127
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-5.5; however:
 Package mysql-server-5.5 is not configured yet.

So the postinstall scripts found something they are not able to run. I’ve been scratching my head for a while until I found on a russian website I needed the bsdutils package:

apt-get install bsdutils

And done!