Comment 5 for bug 600729

Just hit this bug on a fresh Lucid install with JMICRON fake RAID.
Spent multiple hours, having to (1) use Karmic to partition disks, (2) Lucid workstation CD to complete install, and (3) Lucid server CD rescue function to update grub2.

Booting from 10.04 Live CD, the parted/gparted simply does not work.
For example, if the fake RAID device is called /dev/mapper/jmicron_MIRROR,
gparted first primary partition will show up as /dev/mapper/jmicron_MIRRORp1 (note the "p"),
in the mapper, but gparted will invoke mkfs to format the old name /dev/mapper/jmicron_MIRROR1 (no "p") and fail.

This new/old confusion appears in several places. If the 9.10 is used to partition the array,
then the naming is consistent (/dev/mapper/jmicron_MIRROR1, no "p"), and Lucid will happily
install on it.

The introduction of "p" naming convention may have been justified, but it was not done consistently in all utilities and drivers and resulted in an install-blocking issue for certain configurations.

A secondary issue complicated the install as well: in 9.04, 9.10 and 10.04, gparted does not see active fake raid devices, instead it lists physical disks. The workaround is to invoke "gparted /dev/mapper/jmicron_MIRROR", or whatever your RAID device name may be.