I really hate answering my own questiosn but here it goes: The kickstart file is generated by a cgi script that inserted tabs instead of spaces between the keyword and options for the swap partition. When I replace these tabs with single spaces the disk is partitioned as expected - I guess we can close this bug again.
-- swap stanza is ignored https://launchpad.net/bugs/49438 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs