Summary
The node installer checks for the existence of the dusk user and creates it if it doesn't exist. Relevant permissions are also assigned to this user.
In all node installer documentation, this dusk user is named duskadmin but in the node installer script, the user is named dusk. This discrepancy is a bit confusing and leads to slightly frustrating situations where the created duskadmin user doesn't have the required permissions to do things it should be able to do.
Solution
Change the expected user name from dusk to duskadmin in the node installer script.