True, it's not freeware, but what I like best about it is its ability to resize and reformat just about any kind of partition. IMO it's a great tool.
In any event, my purpose in posting was not so much as to promote something I like, but rather to recommend that the partitioning step be addressed as an independent task to be completed prior to beginning the actual Linux installation. In my experience, that simplifies things, but you avoid possible issues with built-in partitioners. -- J.W.