KDE is a free and more customizable graphical desktop environment for Unix systems. Plasma is a widgets based desktop environment. KDE Plasma Desktop is the default desktop environment on many Linux distributions, such as openSUSE, Mageia, Chakra, Kubuntu, Manjaro Linux, and PCLinuxOS.
To install KDE desktop on Linux Mint, you need to add author’s personal repository. Open terminal and run the below command. To open terminal in linux mint mate, click the Main Linux Mint Menu, then go to system tools and select Terminal or type terminal in the search field or click the Terminal icon in taskbar.
sudo add-apt-repository ppa:kubuntu-ppa/backports
Then type your Linux Mint password.And hit enter key confirm the installation.
Then type the below command and hit enter.
sudo apt-get update
Then you must fully upgrade the system via terminal using the below code.
sudo apt full-upgrade
After that if you want to install the latest KDE with all the feature just run the below code in terminal. This will install the full KDE desktop with all KDE softwares.
sudo apt-get install kubuntu-desktop
If you want just the minimal package set necessary to run KDE as a desktop environment, then run the below code in terminal.
sudo apt-get install --no-install-recommends kubuntu-desktop
Type your Linux mint password and Type Y and press enter to confirm the installation.After the sucessful installation of KDE, logout and then select Plasma Desktop to login again using the same linux mint password.