Canonical has decided to drop alternate Ubuntu installation CDs from the next Ubuntu release. This CDs were previously used to install Ubuntu with encryption and also configure RAID arrays for data storage. As per Ubuntu developer Steve Langasek, Ubuntu 12.10 default installation CD will support encrypted installations. Also RAID can be configured easily after installation.
The developer posted in Ubuntu devel mailing list:
"The good news is that this means today we already have support in ubiquity for cryptsetup and LVM in the guided partitioner, with manual partitioning support soon to follow. The somewhat bad news is that we will not have support for RAID setup in ubiquity this cycle.RAID is relatively straightforward to turn on post-install. You install to one disk, boot to the system, assemble a degraded RAID with the other disks, copy your data, reboot to the degraded RAID, and finally merge your install disk into the array. It's not quick, but it's *possible*."
Ubuntu Alternate CDs have been dropped from daily builds and will not be available in beta 1 release.