After days of uptime during which I installed several updates, I shut
the system down, which it did fine.  The next morning I attempted to
boot and have not been able to since (this was four or five days ago).

After choosing the kernel (any kernel), a great deal of trace
information appears on the screen.  I wish I had a way to capture it.
This is what I transcribed by hand at the very end of the trace:

6.657817 sd 7:0:0:0 Attached scsi generic sg6 type 0
6.658041 sd 7:0:0:1 Attached scsi generic sg7 type 0
6.657817 sd 7:0:0:2 Attached scsi generic sg8 type 0
6.657817 sd 7:0:0:3 Attached scsi generic sg9 type 0
6.726048 sd 7:0:0:0 [sde] Attached scsi removable disk
6.726048 sd 7:0:0:1 [sdf] Attached scsi removable disk
6.726048 sd 7:0:0:2 [sdg] Attached scsi removable disk
6.726048 sd 7:0:0:3 [sdh] Attached scsi removable disk 

But I think all that is immaterial.  Earlier in the trace it says
something like "Attempting to mount /dev as boot - device not found",
but I don't have the exact verbiage.  That sounds a lot more suspect.  I
sure would like to know why I can't load Ubuntu from CD...

Is there a way for me to single step the GRUB loader or otherwise add
instrumentation?

Thank you Philip!

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Ubuntu 10.04 won't boot after updates
https://bugs.launchpad.net/bugs/668152
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