Assuming that you haven't worked around this somehow, could you please run:
sudo DEBCONF_DEBUG=developer /var/lib/dpkg/info/grub-pc.postinst configure 1.97~beta2-2ubuntu1
... and post the output to this bug? (You need to type this exactly; copy and paste if necessary.)
Assuming that you haven't worked around this somehow, could you please run:
sudo DEBCONF_ DEBUG=developer /var/lib/ dpkg/info/ grub-pc. postinst configure 1.97~beta2-2ubuntu1
... and post the output to this bug? (You need to type this exactly; copy and paste if necessary.)