How to install Plasma 5.4 on Kubuntu

Question

Can anyone tell how to upgrade Kubuntu 15 plasma to 5.4? I found these commands:

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

But after restart I still have plasma 5.3. Even in Help -> About System Settings I see version 5.3.2. What else I need to do, to upgrade plasma version?

Answer 1

Use this tuto:

1. Add Kubuntu CI Stable PPA:

   sudo add-apt-repository ppa:kubuntu-ci/stable
   

   If you’ve added Kubuntu backports PPA, and it does not yet update with Plasma 5.4. You may remove it via:

   sudo add-apt-repository -r ppa:kubuntu-ppa/backports
   

2. Update system cache and upgrade your system:

   sudo apt-get update
   sudo apt-get dist-upgrade
   

If you’re not in Kubuntu, you may run below command to install KDE:

sudo apt-get install plasma-desktop

If everything goes well, restart your computer to apply changes.

Source: ubuntuhandbook.org

Answer 2

You can check Kubuntu Backports to see when plasma-desktop is upgraded to 5.4. Just search for plasma-desktop on the page.

You might also want to read How to Install KDE Plasma 5.4 in (K)Ubuntu 15.04, especially for the part on how to uninstall the backports ppa if anything goes wrong. I needed that in the past. ;)