If you get 'grub_file_filters' not found due to a problem when upgrading your Linux system, you can immediately think of a solution to reinstall grub. That said, if the system does not boot, there is nothing you can do, so prepare a LiveDVD etc. and boot from there.
Then, start the terminal, become root, and hit the following command.
mount /dev/sdx /mnt
mount --bind /sys /mnt/sys
mount --bind /proc /mnt/proc
mount --bind /dev /mnt/dev
chroot /mnt
grub-install /dev/sdx
Where sdx is the device that points to the boot drive.
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