I get the above mentioned error when I try to add a user.
sudo useradd -u 1200 -g test -c 'studente' student
sudo useradd anyuser
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 GROUP=100 HOME=/home INACTIVE=-1 EXPIRE= SHELL=/bin/bash SKEL=/etc/skel CREATE_MAIL_SPOOL=yes
I must have messed up somewhere by creating, modifying and deleting users and groups but I don’t know where.
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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 100users but before you do that try
grep :100: /etc/group