If you’re running Kubuntu 16.04 LTS (Xenial Xerus) or later, including Kubuntu 18.04 LTS (Bionic Beaver) and Kubuntu 18.10 (Cosmic Cuttlefish), you don’t need to do anything. Snap is already installed and ready to go.
If you need to know which version of Kubuntu you’re running, select About System from KInfoCentre. Alternatively, from the command line, type
$ sudo apt update $ sudo apt install snapd