On Ubuntu Server 22.04 LTS, 20.10 STR & 20.04 and 18.04 LTS, we recommend you only use Snaps. Also verify that only one instance of the agent is installed and running on your instances. If you want to use SSM Agent without Snaps, uninstall the SSM Agent. Then install the SSM Agent as a debian package using the instructions for installing SSM Agent on Ubuntu Server 16.04 and 14.04 64-bit (deb). Before installing, ensure you don't have any Snaps installed that overlap with the list of packages you want managed as debian packages.