Comment 2 for bug 2015401

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Steve Langasek (vorlon) wrote :

The target for installing EFI GRUB must be an EFI System Partition, not a disk. GRUB does not a priori know whether the device you've specified is correct.

The value of this field is supposed to have been populated for you by the installer at install time. So I don't think there's much here we can do to improve this, aside from the error message presented by the postinst ("/" is not the name of an ssd).