KDE Plasma 5.5 has finally been made into the backports PPA for Kubuntu 15.10 Wily after its third bugfix release was announced.
Plasma 5.5 was first released in last December, it features updated Breeze theme, new Plasma Applets, OpenGL ES support in Kwin, and Wayland support without depending on X11/Xwayland.
How to Upgrade:
Kubuntu 15.10 can now upgrade to Plasma 5.5 by following below steps:
1. Launch terminal emulator and run below command to add PPA:
sudo add-apt-repository ppa:kubuntu-ppa/backports
Type in your password (no visual feedback so just type in mind) when it asks and hit enter to continue.
2. After upgrade your system via:
sudo apt-get update sudo apt-get dist-upgrade
Once the upgrade process finished and everything went well, restart your computer.
3. (Optional) To downgrade to the stock version of Plasma in Ubuntu 15.10, install ppa-purge and purge the PPA which as well downgrade all installed packages:
sudo apt-get install ppa-purge sudo ppa-purge ppa:kubuntu-ppa/backports
But I had to add :
sudo apt-get install plasma-desktop
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