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After upgrading to Ubuntu 14.04, I get this error:

error: symbol 'grub_term_highlight_color' not found
grub rescue>

Other instructions on how to deal with this seem to be no use to me because I can't even boot a live USB disk - I get the same error (I have USB first in my BIOS boot order and have successfully booted this way in the past). The error even comes up if I try to enter the BIOS menu at boot.

As far as I can tell I'm stuck in the GRUB rescue prompt. So I started looking at how to boot from it and tried following these instructions

grub rescue> set prefix=(hd1,3)/boot/grub
grub rescue> insmod linux
grub rescue> linux /vmlinuz root=/dev/sdb3 ro
grub rescue> initrd /initrd.img
error: no such partition.
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If you get to grub_rescue then you probably can boot on a USB drive, since you're already after the BIOS. You'll need to access it in order to bring the USB drive above the hard drive in the boot devices priority list. –  John WH Smith Jun 26 at 18:05
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