how to install KDE icon theme in ubuntu? (ROSA Icons)

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http://askubuntu.com – I recently got the great ROSA icon theme from the ROSA repo, I extracted the archive and put it into the .icons folder, under KDE I can select the icons no problem, but under unity using gnome tweak tool they can't be selected (nor in ubuntu tweak) so I assume that there needs to be further steps in order to use a KDE icon theme in the unity/gnome desktop? Any ideas? Thanks (HowTos)