the installer crashed, when I arrive to preparing disk space. when I choos manually (radio button) and next !!!

[net.homeless]

Binary package hint: ubiquity-frontend-kde

error message :
Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/kde-ui.py", line 2694, in index
    childItem = parentItem.child(row)
  File "/usr/lib/ubiquity/ubiquity/frontend/kde-ui.py", line 2734, in child
    return self.childItems[row]
IndexError: list index out of range

content /var/log/syslog

[NM (n.m)]

I get this same error, using Linux Mint install. I'll attach my files too, don't know if it'll help.

[NM (n.m)]

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