ubuntu@modoc:~$ sudo /usr/lib/grub/powerpc-ieee1275/prep-bootdev
device-mapper: deps ioctl on 1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC33900000000A0 failed: No such device or address
device-mapper: deps ioctl on 1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC33900000000C0 failed: No such device or address
device-mapper: deps ioctl on 1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC3390000000020 failed: No such device or address
device-mapper: deps ioctl on 1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC3390000000060 failed: No such device or address
device-mapper: deps ioctl on 1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC3390000000040 failed: No such device or address
/dev/sda1