(RaspberryPi2)ubuntu@localhost:~$ snappy list -v
Name           Date       Version      Developer  
ubuntu-core    2015-09-25 2            ubuntu*    
ubuntu-core    2015-11-13 3            ubuntu!    
config-example 2015-11-25 1.0.6        canonical* 
docker         2015-11-09 1.6.2.004    canonical  
docker         2015-11-13 1.6.2.005    sideload*  
hello-world    2015-11-12 1.0.18       canonical* 
mqtt-piglow    2015-11-23 IGJWYKeGLWea sideload*  
mqtttestclient 2015-11-12 IFOTYdKLCaGB sideload*  
piglow         2015-11-20 IGCNEEceALce sideload*  
snappy-debug   2015-11-13 0.5          canonical  
snappy-debug   2015-11-14 0.6          canonical* 
webcam-demo    2015-11-12 1.0.2        canonical* 
webcam-webui   2015-11-17 IFbYNNbSUdHS sideload*  
webcam         2015-11-18 IFeGRLEgffcQ sideload*  
webdm          2015-10-27 0.9.3        sideload   
webdm          2015-10-29 0.9.4        sideload*  
pi2            2015-09-25 0.16         canonical* 
Reboot to use the new ubuntu-core.