I have 320 GB of HDD and installed Ubuntu to all partition but what if I want to install debian or any other linux distro to the remaning drive parts that are not in use ? Thanks in advance!
closed as not a real question by Alvar, Uri Herrera, Kevin Bowen, Thomas W., Eric Carvalho Jun 22 at 0:42
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the most easy way is to use gparted on a live usb or DVD. to resize a partition you need to unmount and since you cannot unmount your root partition you cannot do it from your normal Ubuntu install. in the answer to this question is a quick overview how to use gparted.