sudo apt update
sudo apt -y full-upgrade
sudo reboot -f
sudo add-apt-repository ppa:kubuntu-ppa/backports
sudo apt update
sudo apt install kde-plasma-desktop kde-standard
Notes:
- You will be prompted to choose display manager. When in doubt, choose
lightdm
. - kde-standard is important as it has many extra tools and widgets including QuickLaunch panel widget.
sudo reboot -f
On login screen, click on icon on top right of widget and choose Plasma (X11)
. This will choose KDE Plasma as your default.
Source: https://techviewleo.com/how-to-install-kde-plasma-desktop-on-linux-mint/