It looks like this is a problem with the KDE version.
http://linuxmint.com/cassandra-kde.html says:
There is a known bug in this release: In the installer, the partitioner
will ask you how you want to partition your drive. if you choose
"Manual" the installer will crash. This is a bug in the KDE frontend of
the Ubiquity installer. You can either use the "Guided" option or if you
need to manually partition, use the Gnome frontend instead:
To solve this problem, open a terminal or a konsole and type:
sudo apt-get install ubiquity-frontend-gtk
sudo apt-get remove ubiquity-frontend-kde
sudo ubiquity
--
the installer crashed, when I arrive to preparing disk space. when I choos
manually (radio button) and next !!!
https://bugs.launchpad.net/bugs/132808
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