Error “useradd: group '100' does not exist”

I get the above mentioned error when I try to add a user.

By trying

sudo useradd -u 1200 -g test -c 'studente' student


sudo useradd anyuser

I get

useradd: group '100' does not exist
useradd: the GROUP= configuration in /etc/default/useradd will be ignored

Content of /etc/default/useradd is

# useradd defaults file

I must have messed up somewhere by creating, modifying and deleting users and groups but I don’t know where.

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Site Moderator
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January 19, 2020
Accepted Answer

Hi @fkutev22,

It seems like you’ve removed the necessary group. Having said that without providing the necessary Operating System - Ubuntu, Centos, Fedora etc.

Most probably it’s groupadd -g 100 users but before you do that try grep :100: /etc/group

Regards, KDSys

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