So I had an amazon ec2 instance crash during the update to 14.04LTS. Frustratingly, it appears the kernel might be bad (or at least that's what the log below says to me, I could totally be wrong). I'm able to mount the volume to another, working server, chroot the broken volume, and sudo apt-get remove linux-headers-3.MOSTRECENT. Unfortunately though, when I try sudo update-grub, it comes back with

/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).

What am I missing?

Here's the log from the server's attempted bootup:

[H[J  Booting 'Ubuntu 14.04 LTS, memtest86+'



root  (hd0)

 Filesystem type is ext2fs, using whole disk

kernel  /boot/memtest86+.bin



============= Init TPM Front ================
Tpmfront:Error Unable to read device/vtpm/0/backend-id during tpmfront initialization! error = ENOENT
Tpmfront:Info Shutting down tpmfront
xc: error: panic: xc_dom_core.c:621: xc_dom_find_loader: no loader found: Invalid kernel
xc_dom_parse_image returned -1

close(3)


Error 9: Unknown boot failure



Press any key to continue...

Thanks in advance!