The Univention modules have a issue with an unassigned variable.

The variable diff is only assigned if state is 'present', else the
variable is unused. But the module will return the diff variable as a
return value. If the state isn't 'present' the module will fail with an
python UnboundLocalError exception.

lib/ansible/modules/cloud/univention/udm_dns_record.py

@@ -123,6 +123,7 @@ def main():
     data = module.params['data']
     state = module.params['state']
     changed = False
+    diff = None
 
     obj = list(ldap_search(
         '(&(objectClass=dNSZone)(zoneName={0})(relativeDomainName={1}))'.format(zone, name),

lib/ansible/modules/cloud/univention/udm_dns_zone.py

@@ -170,6 +170,7 @@ def main():
     mx = module.params['mx']
     state = module.params['state']
     changed = False
+    diff = None
 
     obj = list(ldap_search(
         '(&(objectClass=dNSZone)(zoneName={0}))'.format(zone),

lib/ansible/modules/cloud/univention/udm_group.py

@@ -112,6 +112,7 @@ def main():
     subpath = module.params['subpath']
     state = module.params['state']
     changed = False
+    diff = None
 
     groups = list(ldap_search(
         '(&(objectClass=posixGroup)(cn={0}))'.format(name),

lib/ansible/modules/cloud/univention/udm_share.py

@@ -477,6 +477,7 @@ def main():
     name = module.params['name']
     state = module.params['state']
     changed = False
+    diff = None
 
     obj = list(ldap_search(
         '(&(objectClass=univentionShare)(cn={0}))'.format(name),

lib/ansible/modules/cloud/univention/udm_user.py

@@ -413,6 +413,7 @@ def main():
     subpath = module.params['subpath']
     state = module.params['state']
     changed = False
+    diff = None
 
     users = list(ldap_search(
         '(&(objectClass=posixAccount)(uid={0}))'.format(username),