To add a new user called snuk, use the useradd command:

# useradd -m -g users -G wheel,audio,video,seat,plugdev,netdev,power,input,lp,scanner snuk

Although it is not required to protect the newly created user snuk with a password, it is highly recommended to do so:

# passwd snuk

When lingering is enabled for a user, their user-level systemd instance stays active in the background, so timers, services, and background tasks can run without an active login session.

Add the new created user “snuk” to the lingery database.

# loginctl enable-linger snuk