When using executable from core snap for application command, snapcraft will fail with sanity check. Example of using 'ping' is here: https://github.com/kubiko/avahi-client/blob/master/snap/snapcraft.yaml Workaround is to install desired executable on building host, then check passes. Suggesting snapcraft checks against host, which seems wrong. Surely check should be against core + content of the snap itself (ignoring confinement restriction for binaries in core)