Same here, both with and without pre-seeds. Marking confirmed.
rebooting from the cd in rescue mode and doing 'apt-get install grub2'
lets me proceed.
** Changed in: grub-installer (Ubuntu)
Status: New => Confirmed
** Changed in: grub-installer (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/912431
Title:
Preseeded 12.04 grub-install failed: Wrong number of args: mapdevfs
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