[ubuntu] VNC at the login screen?

[gvansteelant]

Searched the forums but couldn't find an answer to my question so here it goes:
Is it possible to set up VNC so that you can take over the server when it's at the login screen (like after a restart)?
Currently, VNC only works when I'm logged in, which means I have to connect a keyboard after every restart. Bit of a pain when you're trying to run the thing headless.

On a related note, does there exist a utility for Ubuntu like Teleport for Mac OS X where you take over another computer but on that computers screen? In other words: you move your cursor and keyboard input to the other computer but do not copy over the screen output.

Thanks for any help.

Gus