Are you or one of your users getting the following error when trying to execute a sudo command?

[username] is not in the sudoers file. This incident will be reported

Here is how to fix that problem (*see note). As root type:

echo '[username] ALL=(ALL) ALL' >> /etc/sudoers

Obviously substitute [username] with your actual username.

*NOTE: Not every user on your system should be part of the sudoers group. Be sure you are following best security practices, and practices specific for your systems, before deciding whether to add someone to the sudoers group or not.