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

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.

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

Want to learn more? Join the DigitalOcean Community!

Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in Q&A, subscribe to topics of interest, and get courses and tools that will help you grow as a developer and scale your project or business.