RW> can I try an older version of Kubuntu or maybe try Ubuntu 6.02 or
RW> 10.something.

You'd be better trying an up to date but lighter version of Ubuntu
rather than an old version that's no longer supported.

Lubunu / XFCE / LXDE - lots of options for the less powerful system,
just a matter of the time needed to download the ISO and create the
boot CD's