Thanks stress_junkie for the advice - good technical advice I'm sure, but at this stage of just trying things out, I''m reluctant to spend the hard earned cash to replace something which isn't broken.
JimBass you suggested 6.10 - I tried that originally, and couldn't get it to work at all, that's how I ended up with 6.06. After your note I gave it another go, with a freshly cut CD and got the same results - it gets part way through, then stops with the Ubuntu logo, under which is a broken blue line, and then a green line. The two lines (especially the green one) could possibly be text which hasn't displayed correctly, but I can't be sure. The green line does disappear when I hit a key, but nothing else seems to happen.
So ... I'm still trawling through some of the Google hits on the search you suggested. I was surprised to find that an apt-get update and upgrade produced a lot of changes. A question for the Ubuntu site perhaps. Anyway, the X server still didn't start.
I'll keep digging but it is a shame to have to struggle at this stage. I know it must be very difficult to keep a distro up to date with all the drivers for all devices - realistically though obstacles like this will deter the amateur with other things to do!
All suggestions welcome, especially the one which points me to a distro which will install first time on my hardware