On SLES 11 SP 1, while trying to add users with the useradd command, the following is displayed:
useradd: Unknown group `video’.
useradd: Unknown group `dialout’.
Background & Analysis:
The “video” and “dialout” groups are default groups in SLES. This is configured in /etc/default/useradd.
These groups were removed from /etc/group using the groupadd command although the useradd command uses them as default groups.
STEP 1: Modify /etc/default/useradd
Edit /etc/default/useradd and remove video and dialout from the GROUPS directive. After doing so, my /etc/default/useradd looks like this (I have removed the GROUPS directive as I do not want default groups):
GROUP=100 HOME=/home INACTIVE=-1 EXPIRE= SHELL=/bin/bash SKEL=/etc/skel CREATE_MAIL_SPOOL=yes