That's the cause of the failure. FAT32 doesn't support hard links.
I'm closing this report because you've fixed it.
Don't hesitate to submit any new bug.
** Changed in: grub (Ubuntu)
Status: Incomplete => Invalid
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package grub failed to install/upgrade: creating hard link
`/boot/last-good-boot.tmp/vmlinuz' => `/boot/vmlinuz-2.6.27-6-generic':
Operation not permitted
https://bugs.launchpad.net/bugs/280891
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