Jonathan, please attach your /etc/default/grub and /boot/grub/grub.cfg.
Also, as a general rule, please make sure that you've run grub-install
on the right devices since the last upgrade. Run this command to see
what's done automatically:
sudo debconf-show grub-pc | grep install_devices
If this doesn't match the drive(s) you're booting GRUB from, then you
need to run 'sudo dpkg-reconfigure grub-pc' to change it.
Jonathan, please attach your /etc/default/grub and /boot/grub/ grub.cfg.
Also, as a general rule, please make sure that you've run grub-install
on the right devices since the last upgrade. Run this command to see
what's done automatically:
sudo debconf-show grub-pc | grep install_devices
If this doesn't match the drive(s) you're booting GRUB from, then you
need to run 'sudo dpkg-reconfigure grub-pc' to change it.