Fix Ubuntu Grub Boot Error

This error happens usually when the /boot folder is full and grub doesn’t update/install properly when the system is updated.

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error: symbol 'grub_file_filters' not found.
Entering rescue mode...
grub rescue>

One way to fix this is to boot with a Live USB image, mount the boot drive, and update/install grub again.

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mount /dev/<vg/root> /mnt
mount -t proc none /mnt/proc
mount -o bind /dev /mnt/dev
mount -t sysfs /sys /mnt/sys
chroot /mnt
grub-install /dev/sda
update-grub
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