Make sure you have snap installed. It should come pre-installed and you can check it with this command.

sudo snap --version
    # snap    2.48.3+20.10
    # snapd   2.48.3+20.10
    # series  16
    # pop     20.10
    # kernel  5.8.0-7642-generic

If it isn't you can install if very easily with this command

sudo apt install snapd