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a60fb26
(Get the code!)
Thank you kko. I will take a look at bug 6367. However, for completeness, let me add some recent findings here.
As I have alluded to, my computer's motherboard has two IDE controllers, one Intel one Promise. In order to improve the performance of my RAID 0+1 (or is it RAID 1+0?) I have two of my four disks attached to one controller, two to the other. The problem seems to have been that the percieved order of these controllers (and consequently the definition of /dev/sd[ab] vs. /dev/sd[cd]) changed between installation and first boot. The only way to enter the system is to manually edit the grub commands and tell grub that root is on /dev/sdc1 (which it is not).
My motherboard is an ASUS PC-DL. The two disks connected to the Promise are Ultra-IDE and the two disks contected to the Intel controller are SATA.
Now I have all four disks connected to the Promise controller and my problems go away. Not only does grub now find root on /dev/sda1, but /usr is now found on /dev/md1, which is how /usr was defined during installation.
Thanks. Heading over to 6367
Gisli