From useradd(8) man page
This option is only valid in combination with the -o option.
There should be '-u' instead of '-o'.
Invocation of useradd with -o without -u gives correct warning:
useradd: -o flag is only allowed with the -u flag
Version-Release number of selected component (if applicable):
shadow-utils-184.108.40.206-10.fc16 has been submitted as an update for Fedora 16.
* should fix your issue,
* was pushed to the Fedora 16 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing shadow-utils-220.127.116.11-10.fc16'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).
shadow-utils-18.104.22.168-10.fc16 has been pushed to the Fedora 16 stable repository. If problems still persist, please make note of it in this bug report.