I noticed that in the cloud image for xenial (http://cloud-images.ubuntu.com/releases/16.04/release/) there seems to be a group created by default named "admin". It does not seem to be present in 14.04 or in the non-cloud images for 16.04. Does anyone know its purpose?
This causes the useradd command to fail for a user named "admin" without the -g option specified i.e. adding that user "admin" into the pre-existing "admin" group. It would be good to know this group's purpose so I can determine if I should be disallowing the creation of a user named "admin" or if I should just add it to this pre-existing group.