You need to make them system users without the ability to login. Any service on your machine with a dedicated user should be a system only user with no login shell defined.
https://superuser.com/questions/77617/how-can-i-create-a-non-login-user
this post was submitted on 13 Feb 2025
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Can I use usermod to apply the -r after the fact, or do I need to remove the user and redo it correctly?
It's covered in that link, but yes.
Sorry. I made myself "instructional" videos installing things and whatnot on the live USB before installing and BOY!, watching myself go so slowly through everything and still miss obvious stuff is EXCRUCIATING.
But I know who I'm dealing with. I'm solidly average or below.
Which distro, which DE? Or any details at all.
Linux Mint 22.1