Systemctl stop snapd.service

systemctl stop snapd.service
Warning: Stopping snapd.service, but it can still be activated by:
  snapd.socket

See also

• Snap: snap, snapd, snapctl, snapcraft, snap: [list | install |find | info | services | start| stop | remove | refresh | set | logs ] snapd | snap list | snap version | snap find aws | snap --help ]