Add username & group in sudoers file

Error - username is not in the sudoers file. This incident will be reported.

Open the file /etc/sudoers, Add following line in it

username ALL=(ALL) ALL

If your username is john, the line should be

john ALL=(ALL) ALL

If you want to add whole group as sudoers.

%group-name ALL=(ALL) ALL

where % indicates the name is a group.

If your group-name is wheel, the line should be

%wheel ALL=(ALL) ALL