I just upgraded Ubuntu 12.04 to 12.10. I followed the upgrade instructions on Ubuntu's website, and followed all onscreen instructions. My problem is, when I select Ubuntu from the boot menu, it gives me a screen that says at the top:
"GRUB4DOS 0.4.5b 2011-11-27, Mem: 639K/1010M/0M, End: 3554C0 [ Minimal BASH-like line editing is supported. For the first wors, TAB lists possible command completions. Anywhere else TAB lists the possible completions of a device/filename.] grub>"
How do I go about booting Ubuntu from this screen?