I can not reproduce this. I inserted "fallback 1" below "default 0" and ran update-grub. The fallback was still in there afterwards. Do I understand you right in that your "fallback" disappeared? Can you please attach your menu.lst?
** Changed in: grub (Ubuntu)
Status: Unconfirmed => Needs Info
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update-grub wipes out "fallback" settings
https://launchpad.net/bugs/63466
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