adduser desabilitando login

bom dia,
Gostaria de saber como cadastrar usuarios sem possibilidade de login e sem diretorio home.
O sistema pede um (UID) e nao sei qual colocar.
E se deixo em branco acontece isso:
create-home leoncio

Login name for new user: --disabled-login

User ID ('UID') [ defaults to next available ]:1
- That UID is already in use;please choose another
User ID ('UID') [ defaults to next available ]:2
- That UID is already in use; please choose another
User ID ('UID') [ defaults to next available ]: 4
- That UID is already in use; please choose another
User ID ('UID') [ defaults to next available ]: 5

Initial group [ users ]: 1

Additional groups (comma separated) []:

Home directory [ /home/--disabled-login ]

Shell [ /bin/bash ]

Expiry date (YYYY-MM-DD) []:

New account will be created as follows:

---------------------------------------
Login name.......: --disabled-login
UID..............: [ Next available ]
Initial group....: 1
Additional groups: [ None ]
Home directory...: /home/--disabled-login
Shell............: /bin/bash
Expiry date......: [ Never ]

This is it... if you want to bail out, hit Control-C. Otherwise, press
ENTER to go ahead and make the account.


Creating new account...


/usr/sbin/useradd: invalid option -- -
usage: useradd [-u uid [-o]] [-g group] [-G group,...]
[-d home] [-s shell] [-c comment] [-m [-k template]]
[-f inactive] [-e expire ] [-p passwd] name
useradd -D [-g group] [-b base] [-s shell]
[-f inactive] [-e expire ]
- Error running useradd command -- account not created!
(cmd: /usr/sbin/useradd -d /home/--disabled-login -m -g 1 -s /bin/bash --disabled-login)
root@med-slack:~#

Bom dia,
Alguém conhece outra maneira de configurar os usuários através de acesso remoto ou utilitários?
obrigado,
Leo