Tested and also working on NethServer 6.x
Just a note about sudo delegation for both versions: by default users have no shell unless they are assigned ssh access.
# getent passwd user1 # ssh access allowed
user1:x:5000:5000:User One:/var/lib/nethserver/home/user1:/bin/bash
# getent passwd user2 # default (no shell)
user2:x:5002:5002:User Two:/var/lib/nethserver/home/user2:/bin/false