How do I add a user to sudoers in ubuntu? I am trying to add an existing user to my sudoers but can't figure out how to do it. hadoop1 is the user I am trying to add.

hadoop1@ubuntu: +[SHA256] ---+ hadoop1@ubuntu: S cat ~l.ssh/id rsa.pub >> /.ssh/authorized kevs hadoop1@ubuntu: $ chmod 0600 -/.ssh/authorized_keys hadoop1@ubuntu: ssh localhost ssh: connect to host localhost port 22: Connection refused hadoop1@ubuntu:- sudo apt-get update [sudo] password for hadoop1: hadoop1 is not in the sudoers file. This incident will be reported. hadoop1@ubuntu:$ hadoop1@ubuntu: sudo apt-get install ssh [sudo] password for hadoop1: hadoop1 is not in the sudoers file. This incident will be reported. hadoop1@ubuntu$ Su - Password: Su: Authentication failure hadoop1@ubuntu: $