Installing KDE alongside Unity

I am using Ubuntu 15.10 and i would like to install Воплощает 5.4. I did the following steps:

sudo add-apt-repository ppa:kubuntu-ppa/backports sudo apt-get update && sudo apt-get dist-upgrade

Схвати I am using Unity версия of Ubuntu, I tried to install Kubuntu desktop package:

sudo apt-get install kubuntu-desktop

But i am getting following dependecies problem:

The following packages have unmet dependencies: kubuntu-desktop:Depends:software-properties-kde but it is not going to be installed Recommends: apport-kde but it is not going to be installed Recommends: apturl-kde but it is not going to be installed Recommends: kubuntu-driver-manager but it is not going to be installed Recommends: kubuntu-notification-helper but it is not going to be installed Recommends: muon-discover but it is not going to be installed Recommends: muon-notifier but it is not going to be installed E: Unable to correct problems, you have held broken packages.

I tried to handle dependencies by installing these packages one by one:

apt-get -s install software-properties-kde

But it gives another dependency ошибка python3-pyqt5 which in turn gives another dependency ошибка qtbase-abi-5-4-2.