Re: raid 1 and 9.04?
It looks like you would have to use the 'alternate cd'. From what you describe the standard desktop 9.04 is behaving like 8.10 in that respect. If that is the case you would have to use the procedure for installing to a fake raid. Are you starting from scratch or do you have a prior ubuntu version on the raid1 array?
12.10 Quantal w/grub2/Mint13 installed on raid0, Gigabyte AMD MB, AMD 64x4 CPUs at 3.2GHz, 16 GB ram, HD7770 ATI video, dual boot win7 on 64gb ssd and win8 on 1Tb SATA raid. 13.04 installed on raid0 and ssd