(RaspberryPi2)ubuntu@localhost:~$ snappy list
Name           Date       Version      Developer 
ubuntu-core    2015-09-25 2            ubuntu    
config-example 2015-11-25 1.0.6        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   2015-11-14 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          2015-10-29 0.9.4        sideload  
pi2            2015-09-25 0.16         canonical 
Reboot to use the new ubuntu-core.