systeemuser voor make.gitlab faalt

user toevoegen gaat nog niet helemaal goed:

Setting up cncz-userdb-make (0.6.170-1cncz3) ...
/var/lib/dpkg/info/cncz-userdb-make.postinst: 6: /lib/sysuser-helper/sysuser-helper: not found
dpkg: error processing package cncz-userdb-make (--configure):
 installed cncz-userdb-make package post-installation script subprocess returned error exit status 127
Setting up cncz-userdb-ldap (0.6.170-1cncz3) ...
Setting up cncz-userdb-cli (0.6.170-1cncz3) ...
Nothing to deploy (up-to-date)
Processing triggers for man-db (2.9.1-1) ...
Errors were encountered while processing:
 cncz-userdb-make
E: Sub-process /usr/bin/dpkg returned an error code (1)