liuxg@liuxg:~/snappy/desktop/helloworld-demo$ sudo snap set hello username=foo password=bar
error: cannot perform the following tasks:
- Run configure hook for hello (cannot snap-exec: cannot find hook "configure" in "hello")
liuxg@liuxg:~/snappy/desktop/helloworld-demo$ snap --version
snap    2.16ubuntu3
snapd   2.16ubuntu3
series  16
ubuntu  16.04