If you’re using the Kubuntu 16.04 LTS operating system on your personal computer, then you’re stuck with the long-term supported release of the KDE Plasma desktop environment, version 5.8, which was recently updated upstream to version 5.8.8, a maintenance patch adding an extra layer of performance improvements. Because Kubuntu 16.04 LTS is also a long-term supported release, the Kubuntu team is always upgrading the operating system’s core components to new software versions, and they’ve just made the KDE Plasma 5.8.8 LTS desktop environment available to users trough the Kubuntu Backports PPA, along with Krita 3.3.2.