If you can't update - point apt at the archive - for example see lenny:

deb http://archive.debian.org/debian/ lenny contrib main non-free

And for ubuntu:

deb http://old-releases.ubuntu.com/ubuntu/ natty main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ natty-security main restricted universe multiverse

BradsWiki: SupportingOldDebianDistros (last edited 2013-09-14 12:53:08 by BradleyDean)