How to upgrade to KDE Plasma 5 on Ubuntu 14.04.3?

Question

I've followed many tutorial but my KDE is still version 4.12.2....

I've tested

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

but nothing works :(

In some websites I've found this instruction

sudo apt-add-repository ppa:kubuntu-ppa/next
sudo add-apt-repository ppa:neon/kf5

but they dont work either! How to do it in Ubuntu 14.04.3?

I really like the plasma 5 desktop....

Any help would be much appreciated....

EDIT: It's not possible with 14.04 LTS

Answer 1

Run the following commands in terminal:

 sudo add-apt-repository ppa:kubuntu-ppa/backports
 sudo apt-get update
 sudo apt-get dist-upgrade
 sudo apt-get install plasma-desktop plasma-workspace plasma-workspace-wallpapers
 sudo apt-get dist-upgrade

Answer 2

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

Worked for me.

Answer 3

I would recommend just updating Ubuntu itself. You just need to make a boot disk of the latest version of Ubuntu, and select "Upgrade Ubuntu 14.04 to Ubuntu 15.10"(or a similar option). Just follow the instructions. Then type sudo apt-get install kubuntu-desktop at a terminal when you've booted in! Note that you will have to reinstall your programs and change your settings again.