Comment 1 for bug 77602

This doesn't actually have anything to do with reiserfs; it's really bug 67130, which is a (serious) problem with pre-existing partitions in general.

In Kubuntu, there's also bug 42994 (qtparted only supports creating reiserfs filesystems using a broken library that we decided not to ship because the filesystems it created caused our kernel to oops during installation, rather than using mkfs.reiserfs), which will probably affect you. Ubuntu does not suffer from this problem, nor does the Kubuntu alternate install CD.