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I am trying to make the first steps in installing AWS IoT Greengrass to Dell Gateway 3001 via SSH connection. First I need to create an extrauser with --system flag but this fails as you can see below. I am able to create the user without --system though.

Ubuntu Core 16, Kernel version: 4.4.0-150-generic

root@dell:/home/admin# sudo adduser --extrausers --system ggc_user
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LC_CTYPE = "UTF-8",
    LANG = "C.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to a fallback locale ("C.UTF-8").
Adding system user `ggc_user' (UID 111) ...
Adding new user `ggc_user' (UID 111) with group `nogroup' ...
usermod: user 'ggc_user' does not exist
adduser: `/usr/sbin/usermod -p * ggc_user' returned error code 6. Exiting.
root@dell:/home/admin#

Oh and by the way it does add new line with this username to /var/lib/extrausers/passwd even though the procedure gives an error. And I cannot delete this user with sudo userdel --extrausers ggc_ucer it again says that user does not exist. I need to manually remove the line from the file if I want to get rid of it.

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I was able to create the user with useradd command instead of adduser:

First create group: groupadd --extrausers --system ggc_group

and then the user: useradd --extrausers --system -g ggc_group ggc_user

So I think the first step is now done :D

This answer helped me: https://unix.stackexchange.com/questions/121071/what-does-adduser-do-that-useradd-doesnt

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