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# add user to sudoers group: '''visudo'''# add user to sudoers group: '''vigr -s'''COMMEND ON SYSTEM WON'T ACKNOWLEDGE CHANGES TO SUDOERS: "''I just did this and yes, I did in fact have to reboot. So, maybe the previous answer wasn't wrong, but it definitely isn't right 100% of the time. Writing this in case someone else is looking for the answer as I just was.''" -Andrew Harrell on Ask UbuntuIt would be bad if this was not at a kernel level and required a system wide restart, too much like Micro$oft. Not verified. Further testing required.Also user needs to make sure sudoers is not commended out in the /etc/sudoers file: type '''visudo'''