Add sudoer

Open the sudoers file: sudo visudo will open the /etc/sudoers file in GNU nano. If not, try export EDITOR="nano" and try sudo visudo again.

Add the below line to the end of file.

`username ALL=(ALL) ALL` **Change the user name before you issue the commands**

Then perform WriteOut with Ctrl + O. The editor will ask you for the file name to write into. The default will be /etc/sudoers.tmp:

Quit the nano editor with Ctrl + X.