Thanks for your report. I fixed this in grub2 1.98+20100527-1:
* Don't fail on purge if the ucf association has already been taken over
by a different grub package (closes: #574176).
** Changed in: grub2 (Ubuntu)
Status: New => Fix Released
** Changed in: grub2 (Ubuntu)
Assignee: (unassigned) => Colin Watson (cjwatson)
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package grub-efi-amd64 (not installed) failed to uninstall residual config
https://bugs.launchpad.net/bugs/620996
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