Yep,
that post made as much sense as this one.

@reinob
But what 'visudo' are you talking about?
Never used that on N900 (only ubuntu systems ).
And now when I run visudo I get:
visudo: no editor found (editor path=/bin/vi)
but vi is in /usr/bin/vi ?

p.s.: lived well with sudoers.d and update-sudoers