How to solve "User is not in sudoers file, incident reported"

Solution 1:

sudo exclusively uses account names, not the user's full name. As a hint, account names don't contain spaces, so "Syammala Naidu" is not correct.

To find out a user's account name:

1. Open Terminal and run:

   id -un
   

or, alternatively:

1. Open System Preferences.

2. Select Users & Groups.

3. If necessary, click the lock on the bottom left corner of the window and type an administrator's name and password to unlock the preference pane.

4. Right-click the account and select Advanced Options....

5. Locate the Account name property:

   

Use that account name in /etc/sudoers. To edit the file, use visudo. For more information, check man visudo and man sudoers.