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And mount them only if we're installing grub-efi* to avoid adding a bogus 'uefi-firmware' menu entry when ignore_uefi is set. Also, remove /proc mount from postinst since grub-installer does it too.
And mount them only if we're installing grub-efi* to avoid adding a bogus 'uefi-firmware' menu entry when ignore_uefi is set. Also, remove /proc mount from postinst since grub-installer does it too.