Upgrading To KDE Plasma 5.3 On Kubuntu 15.04

Kubuntu 15.04 provides a great experience of the new KDE stack but the version being shipped by this KDE spin of Ubuntu is Plasma 5.2 given that it was the latest available for last week's 15.04 Vivid Vervet release. For those wishing to try out KDE Plasma 5.3, it's now easy thanks to the packages landing in Kubuntu Backports...