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

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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-3.2.0-34-generic
Found initrd image: /boot/initrd.img-3.2.0-34-generic
Warning: Please don't use old title `Ubuntu, with Linux 3.2.0-34-generic' for GRUB_DEFAULT, use `Advanced options for Ubuntu>Ubuntu, with Linux 3.2.0-34-generic' (for versions before 2.00) or `gnulinux-advanced-159c7754-a054-4b6a-bfb3-55bf175abac7>gnulinux-3.2.0-34-generic-advanced-159c7754-a054-4b6a-bfb3-55bf175abac7' (for 2.00 or later)
Found linux image: /boot/vmlinuz-2.6.32-5-686
Found initrd image: /boot/initrd.img-2.6.32-5-686
cat: /video.lst: No such file or directory
/usr/sbin/grub-probe: error: failed to get canonical path of .
/usr/sbin/grub-probe: error: cannot find a GRUB drive for .  Check your device.map.
dpkg: error processing grub-pc (--configure):
 subprocess installed post-installation script returned error exit status 1

I've searched through the config files in /etc/grub.d/ and /etc/default/grub, and have been unable to find an erroneous "." anywhere, and these files were working fine before the upgrade.

How can I just whipe out all the files in grub.d and replace them with the default versions?

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