I updated a working server from 10.04 to 12.04.1 today. Everything upgraded without error. However, there is an odd issue with grub and the new kernel (3.2.0-30-generic). After grub boots, the system says "Starting up..." and switches to a text-based full-screen progress bar (with 4 dots) for 20 seconds, then it drops to a BusyBox shell. No matter how long I wait, I can simply type "exit" and the boot process switches back to the text-based full-screen boot progress bar and ultimately boots successfully. No errors at all.
My kernel in 10.04 (126.96.36.199), which I still have, will boot without triggering the BusyBox prompt. I have already tried running
update-initramfs and my LVM volume UUID's match what's in
Is there a log I could check to see why the new kernel thinks it needs to enter the BusyBox shell, since the initramfs shell doesn't offer any clues and it boots fine after exiting the shell?