Execute sudo command without authenticating via password

The approach to solve your problem is to put your user in sudoers file, like you can see.

Open terminal window and type:

sudo visudo

In the bottom of the file, type the follow:

username ALL=(ALL) NOPASSWD: ALL

Where username is your username in your system. Save and close sudoers file (if you haven't changed your default terminal editor (you'll know if you have), press ctl+x to exit nano (but note that the screenshot below shows vim), and it'll prompt you to save).

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After this, you can, in terminal window, type sudo <Whatever you want>, without being prompted for the password.

This only applies, to sudo command in terminal window. For example, when you try to install a package in software center, you will be prompted to insert your password, like you can see in the next Screenshot.

Sources: http://askubuntu.com/questions/147241/execute-sudo-without-password