linode/docs — pull request #59 by Asciant (2014-08-24 00:30:58+00:00)
Title: Add creation of groupadd

Adding the creation of the groupadd command will avoid the following message (on CentOS and I guess some other distros):

[root@localhost ~]# usermod -a -G sudo example_user
usermod: group 'sudo' does not exist

This may save a Google search to find the groupadd command.