I have bought a laptop with Ubuntu 12.04, which runs fine but wants to update. I don't have the password and it won't let me update anything. I have downloaded 12.04 in order to re-install it and it tells me it isn't suitable for my processor.

The machine is a Dell latitude D505. I tried downloading the i386 version and on booting with the disc, I get:

This kernel requires features not present on CPU. pae. Unable to boot. 

All I'm trying to do is to let software updater do it's stuff but as it asks for a password, I can't proceed. I've tried changing password in root shell but that doesn't work.

Any ideas?

Nothing seems to be working with this problem, so maybe I'll just wait for the next official release and try again.