Installer crashes

[deb_untu]

I tried 8.04 live CD.Everything worked well.

Since I have 256 MB RAM,I choose the 2nd option(install option).

It could boot and start installing.

Everything goes well until 94% of the installation and installer suddenly crashes without any message.

This happens exactly at 94% (configuring boot loader).

I tried to install several times & the problem is the same.

I have Debian installed on (/dev/sda13)& it has installed its own grub on mbr.
Kubuntu at (/dev/sda10), grub installed on its home partition.

I also tried to install after uninstalling the grub(on mbr) installed by the Debian (grub 0.97).

Still I have the same problem.

Please help me.
Thanks.