I've installed Ubuntu 11.10 from Windows Vista using Wubi, on my secondary hard drive. I want to install Kubuntu 11.10 in addition to Windows and Ubuntu on this secondary hard drive. It has 1 partition in NTFS . I've already prepared a live USB key with Kubuntu on it. What should I do now?
By default wubi will remove the existing install prior to installing the second.
The best you can do is to install Kubuntu inside your Ubuntu and then choose at login which to use.
If you find there is not enough room it is possible to increase the size of the wubi disk - https://wiki.ubuntu.com/WubiGuide#How_do_I_resize_the_virtual_disks.3F
Search for kubuntu-desktop in Software Centre or if you wish to do so from a terminal the command is
You will end up with multiple entries in your menus.
If you wish to then remove kubuntu you can find details here - make sure to use correct version
Wubi Guide - https://wiki.ubuntu.com/WubiGuide
Start with splitting this into 2 partitions: 1 with Windows, 1 empty formatted to
After that you can install either kUbuntu (KDE) or Ubuntu (Gnome/Unity) on this new partition.
You will end up with actually 2 operating systems installed (and not a wubi install) and you will get a prompt at boottime to choose what system to start. You can still use Ubuntu from within Windows with the WUBI install.