ubuntu@localhost:~$ sudo snappy install upnp-server-amd64.ogra
Installing upnp-server-amd64.ogra
45.41 MB / 45.41 MB [===========================================================================] 100.00 % 2.36 MB/s 
upnp-server-amd64 failed to install: cannot open snap: unknown header: "!<arch>\ndebian-binar"
ubuntu@localhost:~$