hrm not sure if it's exactly as with the last iso - anyway I installed the 64 bit iso on a spare partition and lo and behold - again there are UUIDs in my fstab that don't have anything to do with my system.
The partitions I marked were appended as /dev/sdx0 etc at the end so it did boot alright but still - that shouldn't happen.
the most "offending" line was "UUID=385ecae6-bd34-41c3-a524-974b8cd6d17f / ext3 errors=remount-ro 0 1" and I've never used ext3 in my life
Wanna bet that UUID matches a partition on one of the devs' HDs?
Oh and also my swap partition wasn't recognized - had to enter that one manually.
I realize for most people here all this is not much of a problem but it's a tripping wire for lots of newbies(that's not to say I'm not one of them - fstab is just one of the very few things I was able to pick up ). And they should have the options to loose the somewhat bloated ubuntu base too.