(RaspberryPi2)ubuntu@localhost:~$ sudo snappy install grovepi-server.xiaoguo
Installing grovepi-server.xiaoguo
grovepi-server failed to install: received an unexpected http response code (401) when trying to download https://public.apps.ubuntu.com/download/xiaoguo/grovepi-server.xiaoguo/grovepi-server.xiaoguo_1.0_armhf.snap