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