You need to put them above line 52 - not just above the Ubuntu entry.
Not below. Otherwise it will be modified, just as the file itself says.
### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the
I was aware of that and am fairly certain that I did so (I should have
mentioned that in my report). Could there be anything else that caused
it? - I edit that list a fair bit and have never slipped up before.
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[Gutsy] Windows no longer on Grub list
https://bugs.launchpad.net/bugs/147524
You
I guess that it is possible that I put it above that
# END DEFAULT OPTIONS
line, thinking that it was the line about automatic kernels.
Perhaps we should assume that is what I did and leave this as invalid.
Thanks for your help :).
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[Gutsy] Windows no longer on Grub list