ubiquity migrator fails on linux_raid_member

[mc]

when installing mint 12 migrator inside the installer fails because of:

ubiquity:mount: unknown filesystem type linux_raid_member
migration-assistant: error: failed to mount /dev/sda2

(sda2 and sdd2 were a former md something)

that in turn makes the whole installation fail because the process crashes (and tells me to start a bug reporting tool, which it didnt) and while the next window says that it failed and will continue installation, it did not continue anything, rendering grub unuseable (atleast on a btrfs, about to try ext4 w/ manual mount -o bind /dev , chroot /target , grub-install /dev/sdb6)

sadly i'm not getting the copy+paste from xterm to work so it retyped the messages above.

also after rebooting after using btrfs the filesystem consisted of /@ and /@home, while /@ seemed to contain the directories a normal / should have - not sure where this came from or wether this was "normal", for, for example, btrfs.

[mc (78luphr0rnk2nuqimstywepozxn9kl19tqh0tx66b5dki1xxsh5mkz9gl21a5rlwfnr8jn6ln0m3jxne2k9x1ohg85w3jabxlr-launchpad)]

some more information, i had 4 HDDs (SATA) in my Desktop:
sda - swap + 0xFD
sdb - NTFS + NTFS + swap + 0x83
sdc - FAT16 + HFS
sdd - swap + 0xFD

i suspected some problem with the dvd media, so i burned a CD (x64 both) and tried installing, same sh*t.

then i tried to alter 0xFD to 0x82, but there seems some kind of file(1) running detecting the partitions, so that failed the same too.
then i removed the sda-partitions, which kinda worked up to the point where grub-install ran, which complained about "no partition on sda, failsafe check aborted". I added back the old partitions and ran grub-install manually (and then let the graphical installer continue) - reboot => grub shell.

at this point i got pissed and removed all disks but sdb (which is sda now, obviously) and installed mint from cd - now i finally have a working grub.

[Bruce Fowler (brf531)]

My problem is similar enough to this that I will add it here. I encountered this both with Mint and Xubuntu.

Ubiquity installer hangs with no error indications in the migration step of install, when there is a raid set present. This happens whether or not the install is actually TO the raid set. Apparently it has a problem scanning the raid set for other operating systems (which includes Windows XP in my case).

After screwing around for a couple of days, I discovered the Ubiquity man page, which helpfully tells you that the "--no-migration-assistant" flag will skip over the migration assistant step. This allows a successful install on a raid set.

So there is a work-around, nonetheless, migration-assistant has a bug that needs to be fixed. I would be willing to run an install with whatever debug flags need to be set, and report the result. Just ask.