I ran the Windows (Vista) based installer and everything appeared to be successful except when I choose Ubuntu from the boot menu, the screen flashes between red, green, blue, black and white.
I have tried the various diagnostic options without success except that one time I got in and got the desktop but had DNS access (i.e., nslookup worked) but could not ping any external sites. Now I have not been able to get back to that point.
I am installing on an old Dell M1730 running Vista.
I am pretty comfortable with Ubuntu once I get the thing started :-), as I use it at work (and years ago I put myself through grad school as a UNix syadmin!).