By default, Ubuntu uses nano for editing visudo.

Nano is the linux editor for Windows administrator . . . don't use it!

To change it to something else, such as vim:

sudo update-alternatives --config editor
There are 4 choices for the alternative editor (providing /usr/bin/editor).

  Selection    Path …

While never a good idea to enable this in a production, or multi-user system, on a lab system, not needing to type in a password when running sudo makes life a lot easier.

• To enable password-less sudo:

  sudo visudo
  

• Add this to the bottom of the file, assuming your username is tom:

  tom ALL=(ALL) NOPASSWD: ALL
  

• If we …

Horrible idea in a production box, but great idea for a single user lab system.

To accomplish this, we'll use the visudo command, which edits the /etc/sudoers file in a safe manner, aka, protect you from seriously messing up your system.

sudo visudo

At the bottom of that file, add (assuming your username is tom, …