How to Install KDE Plasma 5.4 in (K)Ubuntu 15.04

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The KDE Community finally announced the release of Plasma Desktop 5.4.0 yesterday morning.

Plasma 5.4 brings much improved high DPI support, a new fullscreen launcher, a new Audio Volume applet, over 1400 new icons, KRunner auto-completion and search history support.

With Plasma 5.4 the first technology preview of a Wayland session is released. On systems with free graphics drivers it is possible to run Plasma using KWin, Plasma’s Wayland compositor and X11 window manager, through kernel mode settings.

For more details, read the official announcement.

Install / Upgrade Plasma 5.4 in (K)Ubuntu 15.04/(K)Ubuntu 15.10:

KDE Plasma 5.4 now is available in Kubuntu CI PPA for both KUbuntu 15.04 and Kubuntu 15.10. To install it, open a terminal emulator from launcher and run below commands one by one:

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.

To revert back your (K)ubuntu to previous status, install ppa-purge and purge the PPA as well as downgrade installed packages:

sudo apt-get install ppa-purge && sudo ppa-purge ppa:kubuntu-ci/stable

Soure: http://ubuntuhandbook.org/index.php/2015/08/install-kde-plasma-plasma-5-4/