Comment 4 for bug 475864

For what it's worth, this issue seems to affect regular kickseeding as well. A kickseed partition configuration that worked fine in Jaunty seems to be ignored in Karmic. I even tried the latest system-config-kickstart to see if the syntax changed but it still seemed to ignore any part lines (it seemed to see the clearpart though).

I even tried to switch to preseeding partition settings but like the original poster, it seems that anything that actually defines a custom partitioning scheme is ignored and the only thing that works is preseeding it to use the full disk and automatically partitioning it with a single / and swap.