liu-xiao-guo@localhost:~$ snap changes
ID   Status  Spawn                 Ready                 Summary
90   Done    2016-10-14T11:40:58Z  2016-10-14T11:41:04Z  Remove "lights" snap
91   Done    2016-10-14T11:41:30Z  2016-10-14T11:41:37Z  Install "lights" snap from file "lights_0.1_arm64.snap"
92   Error   2016-10-14T11:51:46Z  2016-10-14T11:54:24Z  Remove "lights" snap
93   Doing   2016-10-14T11:54:33Z  -                     Remove "lights" snap