Remember, remember, the 16th of November, distro, testing whatnot. This be a long, negative review of Kubuntu 15.10 Wily Werewolf 64-bit edition with Plasma desktop, tested in a multi-boot Windows/Linux environment on a laptop with UEFI, Secure Boot and GPT, covering live session, installation, and post-install use, including look & feel, network connectivity - Wireless, Bluetooth, Samba sharing and printing, smartphone connectivity, touchpad, dangerous partitioning, multimedia playback - HD video, Flash, MP3, applications, battery life, resource usage, hardware compatibility and stability, customization, numerous, teething problems across almost all domains of usage, and more. Enjoy if you can. http://www.dedoimedo.com/computers/kubuntu-werewolf.html Cheers, Mrk
Could you try adding ppa:kubuntu-ppa/backports and updating just update one more time? Any differance?