Grub2 and multiple boot different ubuntu versions

[Tom H]

> BTW: I just had a mass of updates on lucid and one of them was:
> grub2 (1.98-1ubuntu2) lucid; urgency=low
> That of course gave me the option to keep my existing bits, so I
> selected yes. And of course it didn't, so I had to go back in and apply
> Tom's mod's to the lucid /etc/grub.d/30_os-prober as well. Then
> reinstall in karmic, etc. It's now back to normal... well almost; I of
> course have 3 memory test entries that I need to clean up (one from
> hardy, one from karmic, and one from lucid) as I only need one.

I suspect that the only "bits" of yours that a grub upgrade will keep are
/etc/default/grub
and
/etc/grub.d/40_custom
:(

For the memtest entries you could
chmod 644 /etc/grub.d/20_memtest86
and edit
/etc/grub.d/40_custom
to display one of the memory tests