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.

Submit an answer
Answer a question...

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

Sign In or Sign Up to Answer

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Site Moderator
Site Moderator badge
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