sudo asking for password even though user doesn't have a password set
I found an answer that works perfectly (although it requires temporarily adding a password to your user first):


Open the Terminal

Type: sudo visudo

Enter your user's password (create one if necessary).
Change this line FROM:

%admin ALL=(ALL) ALL

TO:

%admin ALL=(ALL) NOPASSWD: ALL

(press 'i' to enter insert mode if you can't edit the text)
Write and Quit

:wq

(press 'esc' first to enter command mode)