When it boots into Terminal mode, type "startx" (without the quotes) and hit Enter. Then you can use the clickable settings menus to choose a Session for Kubuntu to boot into by default (select KDE).
With a good internet connection, open Synaptic Package Manager, scroll down to find kubuntu restricted-extras and Mark it for Installation using the mouse. Also select libdvdcss2, then click Apply. When it's done installing that (it's a "meta package" that includes abuncha multimedia codecs), close Synaptic and try a DVD. If it works, yay!!! If not, let us know so we can help you further. When (if) you do, please tell us about your computer as well (hardware). That is often necessary information when it comes to certain drivers and such.
-Robin
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