How to add user without displaying it on ubuntu login screen?

Question

ubuntu

I thought the "system user" option would work for me, but I can't connect to the user via ssh.
In addition, it is still visible when you need to enter a password through sudo, you can choose from several users.

How to add a user only so that he is really hidden?

Answer 1

it turns out you can make the user id less than 500 (maybe less than 1000 in some distributions)
and the user will be visible only on the confirmation screen where you need to enter the password
command
sudo usermod -u 450 user-name
450 for example

Answer 2

I have a mint - shield the same bubunt, but there are different managers.
If lightdm,

then look at this

If GDM then look for something like that, I don’t use it, so I don’t know, look either on the site for bubunts or archwikis