For reference: https://github.com/snapcore/snapd/blob/master/store/store_action.go#L334 is the relevant part in the snapd source which seems to set the channel of the refresh request to "stable" in case there is no tracking channel for the installed snap.
For reference: https:/ /github. com/snapcore/ snapd/blob/ master/ store/store_ action. go#L334 is the relevant part in the snapd source which seems to set the channel of the refresh request to "stable" in case there is no tracking channel for the installed snap.