Add a user to sudoers file

Scenario: You’re trying to execute a command with sudo:

$sudo ./utstart install

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

[sudo] password for www-data:
www-data is not in the sudoers file.  This incident will be reported.

Adding a user to sudoers:

usermod -a -G sudo username

As root:

usermod -a -G sudo www-data

Note that sudo rights will not be enabled for any users currently logged in. They will need to logout before they can use sudo to gain root rights.

You are reading this post on Joel G Mathew’s tech blog. Joel's personal blog is the Eyrie, hosted here.