[lubuntu] after upgrade: "grub-probe: error: cannot find a GRUB drive for ."

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http://ubuntuforums.org – I installed lubuntu 12.04 on this machine, an old Thinkpad T30, alongside Windows XP. Since I can't access Quickbooks through lubuntu, the machine being too slow to run a virtual machine reliably, I used grub-customizer to move XP to the top of the grub list, and set the save-default option. Now, any time update-grub runs, I get this error: Code: Installation finished. No error reported. Generating grub.cfg ... using custom appearance settings Found linux image: /boot/vmlinuz-3.5.0-19-generic Found initrd image: /boot/initrd.img-3.5.0-19-generic Found linux image: /boot/vmlinuz-3. (Hardware)