Comment 9 for bug 440831

I have this problem after doing an install from the alternative CD 11.10 so it'snot just isolated to the live CD.

mdadm may well have been removed for speed reasons, but then Disk Utility needs to fail gracefully and not as it does show that mdadm completed successfully.

Please don't be fooled that everyone that might come across this can fix it, I have never done raid on Linux before and I am still learning, and struggling after 2 days (i.e. 2 days after first attempting to create an RAID array its still not functional). Issues like mdadm and Disk Utility not working nicely together, do indeed make me wish for the days when I used to do this in Windows with a huge amount of comparative ease.