Failed to install or refresh a snap: ‘mir-kiosk-x11’ does not exist or is not available on the desired channel ‘edge/core18’. Use snap info mir-kiosk-x11 to get a list of channels the snap is available on.
BUT: I ran a quick test with a fresh snapcraft init and the above stage-snaps stanza resulted in the same error:
Failed to install or refresh a snap: 'mir-kiosk-x11' does not exist or is not available on the desired channel 'latest/edge/core18'. Use `snap info mir-kiosk-x11` to get a list of channels the snap is available on.
However, snap install mir-kiosk-x11 --channel=latest/edge/core18 works fine and downloads revision 13, while latest/edge has revision 10.