(amd64)ubuntu@localhost:~$ sudo snappy update
Installing webdm (0.8)
Starting download of webdm
6.16 MB / 6.16 MB [=============================================================================================================] 100.00 % 263.67 KB/s 
Done
Waiting for webdm_snappyd_0.6.1.service to stop.
garbage collection impossible: prerequisites untrue: more than one active (should not happen).
(amd64)ubuntu@localhost:~$