Cies posted a link to https://github.com/cies/kubuntu-setup#remove-snap

They give the suggestion to remove via

   sudo rm -rf /var/cache/snapd/ && sudo apt autoremove --purge snapd && rm -fr ~/snap

And make sure it never installs again:

   sudo bash -c "cat > /etc/apt/preferences.d/no-snapd.pref" << EOL
   Package: snapd
   Pin: origin ""
   Pin-Priority: -1
   EOL