Bug#583735: grub error: unknown filesystem
Next try with the daily build from
This is a Debian 6.0 (squueze) installation CD-ROM.
It was built 20100538-10:07; d-i 20100530-03:55.
After the installation is finished and the system is rebooted the following
message appears on the screen:
Welcome to GRUB!
error: unknown filesystem.
Entering rescue mode...
At this point the grub is waiting for user interaction.