Kubuntu 16.04 comes with KDE Applications 15.12 containing all your favourite apps from KDE, including Dolphin. Even more applications have been ported to KDE Frameworks 5 but those which aren’t, should fit in seamlessly. For a complete desktop suite of applications we’ve included some non-KDE applications such as LibreOffice 5.1 and Firefox 45. Plasma 5, the next generation of KDE's desktop has been rewritten to make it smoother to use while retaining the familiar setup.The fifth set of updates to Plasma 5 is the default in this version of Kubuntu.
Kubuntu is a free, user-friendly Linux distribution based on KDE's desktop software and on the award-winning Ubuntu operating system. Besides providing an up-to-date version of the KDE desktop at the time of the release, the project also releases updated KDE packages throughout the lifetime of each release.