Adding a new user in sudoers list with root user privilege (ubuntu)

For adding a new user in the 'sudoers' list follow the procedures given below:
(in order to do this you should have root user privilege)

--> Take terminal window (from Applications->Accessories->Terminal or press Ctrl+Alt+T)

--> Type the command: sudo visudo

the terminal will display something like this:

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GNU nano 2.2.2            File: /etc/sudoers.tmp

 

# /etc/sudoers
#
# This file MUST be edited with the 'visudo' command as root.
#
# See the man page for details on how to write a sudoers file.
#
Defaults        env_reset

# Host alias specification

# User alias specification

# Cmnd alias specification

# User privilege specification

root    ALL=(ALL) ALL

# Allow members of group sudo to execute any command after they have

# provided their password

# (Note that later entries override this, so you might need to move

# it further down)

%sudo ALL=(ALL) ALL

#

#includedir /etc/sudoers.d

# Members of the admin group may gain root privileges

%admin ALL=(ALL) ALL

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--> Now, after the 'root ALL=(ALL) ALL' statement, add your username in the following syntax:

domainname\\username = ALL=(ALL) ALL

eg: CODETECH\\tiger ALL=(ALL) ALL

Note: at the time of login you have to give CODETECH\\username as username