Quoting Jake Grimmett jake.grimmett@nimr.mrc.ac.uk:
Unfortunately, when the server completes the install and reboots I am stuck at a GRUB prompt.
Most likely, the grub.conf file ended outside of BIOS addressable disk space. Your root partition which contains /boot directory is just shy of 50GB, most today's BIOSes can address only about first 8 gigs of disk or so. You were lucky that the kernel and initrd image ended up somewhere near the beggining of the partition (inside BIOS addressable 8GB of disk) so you were able to boot manually. However, on next kernel update, you might not be that lucky. The solution is to create small partition for /boot at the very beggining of disk. 100MB is more than enough for the /boot.
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