Kubuntu 15.10 is available for upgrade or install.

Getting Kubuntu 15.10

Upgrading from 15.04 Download a Disk Image To upgrade to Kubuntu 15.10 run Muon Update Manager and update your current system, then click on Upgrade. Full instructions to upgrade from 15.04. Download a bootable image and put it onto a USB drive or DVD

Plasma 5 slick desktop Plasma 5, the next generation of KDE’s desktop has been rewritten to make it smoother to use while retaining the familiar setup. The fourth set of updates to Plasma 5 (current release, including the fixpack) is the default in this version of Kubuntu.

KDE Applications 15.08 Kubuntu comes with KDE Applications 15.08 containing all your favorite apps from KDE, including Dolphin. This is the first stability update, and contains bugfixes and translation updates. 107 applications have been ported to KDE Frameworks 5 but those which aren’t should fit in seamlessly. Non-KDE applications include LibreOffice 5.0 and Firefox 41.

Known Problems Bugs tagged Kubuntu 15.10 (1413521) desktop folderview needs to be added on first boot on oem installs

(1439720) Port kubuntu_langpack_desktop_files.diff for .desktop gettext support

(1442512) Apport-kde crash when reporting bugs

(1449265) accounts kcm can not change user’s password because kdepasswd is missing

(1451728) kde-config-telepathy-accounts package install error

(1490618) Ship qtdeclarative5-xmllistmodel-plugin and libqt5qml-graphicaleffects by default Common Release issues can be found here.