This bug is realy much deeper. Follow this steps: 1) upslug your nslu2 with debian lenny 5.0.2 2) Attach 2 usb keys (in my case with 16GB each one)3) start the debian-installer in expert mode and try to make a partition for RAID 1 in each usb key and then pass to configure the this partition. Mark as / and RAID 1.
4) The d-i restarts. Any expert could reproduce this bug? Xan.