I need to install a package. For that I need root access. However the system says that I am not in sudoers file. When trying to edit one, it complains alike! How I am supposed to add myself to the sudoers file if I don't have the right to edit one?

I have installed this system and only administrator. What can I do?

Edit: I have tried visudo already. It requires me to be in sudoers in the first place.

amarzaya@linux-debian-gnu:/$ sudo /usr/sbin/visudo 

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

[sudo] password for amarzaya: 
amarzaya is not in the sudoers file.  This incident will be reported.
amarzaya@linux-debian-gnu:/$