Plus what you need to do beforehand

Linux Mint is a popular, easy-to-use Linux distribution that offers a variety of features to make your computing experience more enjoyable. If you want to further enhance your experience, you can try installing the KDE Plasma desktop environment.

KDE Plasma is known for its modern, customizable interface and rich set of applications that suit different types of users. By installing KDE Plasma on your Linux Mint system, you will gain access to an elegant and powerful desktop that can be customized to your preferences, while still enjoying the stability of Linux Mint.

Before you can install the KDE Plasma desktop on Linux Mint, you need to update Linux Mint and import the KDE Backport PPAs (Personal Package Archives) required for the installation.