On the unallocated area => Right Mouse Button => New => Logical => Ext4. And as follows:
1. 10 GB for " / " (system);
2. The rest of area (GB) for "/home" (user's directory).
3. Swap may be the same, which already exists.
=========
PCLinuxOS will install his own Grub (0.97) => Install it on the MBR of /dev/sdc (default, but you must check it out in installation process). Now I have
very important question:
Where did you install Grub 2 from *buntu? (/dev/sda, /dev/sdb, or /dev/sdc)
AND which one of your disks (sda, sdb, sdc) is
the first boot device in BIOS? If Grub2 is installed on MBR /dev/sdc you should to recover it from
chroot and livecd
after PCLinuxOS' installation.
======
If your computer boot from /dev/sda, after installation of PCLinuxOS, you simply add its menuentry to file:
/etc/grub.d/40_custom
It look like this:
menuentry "PCLinuxOS 2011" {
set root=(hdX,X)
linux /boot/vmlinuz
initrd /boot/initrd.img
}
X,X - number of disk and partition - Grub2 counts HDD from "zero" and partitions from "one".
Save changes and run (as root):
update-grub