It is a Unity-like "United" theme by llucas for KDE Plasma 5.9. It's a new theme released at January 2017. Installing this theme gives you Unity desktop layout (vertical & horizontal panel) and Unity Ambiance's look (dark titlebar, orange close button). It's easy to install and configure. The rest of this article shows the screenshots and how to install it. Thank you llucas for creating United.
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