$ sudo snappy list -u
Name                Date       Version    
canonical-pc        2016-02-02 3.0        
canonical-pc-linux* 1-01-01    4.4.0-10-1 
ubuntu-core*        1-01-01    16.04.0-25 
ubuntu@snappy-1604-edge-amd64:~$ sudo snappy update
Updating ubuntu-core (16.04.0-25)
75.88 MB / 75.88 MB [==========================================] 100.00 % 3.74 MB/s 
Updating canonical-pc-linux (4.4.0-10-1)
124.97 MB / 124.97 MB [========================================] 100.00 % 8.51 MB/s 
2016/03/09 16:24:32.259269 sort.go:158: Invalid version "4.4.0-2-1", using '0' instead. Expect wrong results
2016/03/09 16:24:32.259685 sort.go:162: Invalid version "4.4.0-10-1", using '0' instead. Expect wrong results
2016/03/09 16:24:32.260048 sort.go:158: Invalid version "4.4.0-6-1", using '0' instead. Expect wrong results
2016/03/09 16:24:32.260370 sort.go:162: Invalid version "4.4.0-2-1", using '0' instead. Expect wrong results
Name               Date       Version    Developer  
ubuntu-core        2016-03-09 16.04.0-25 canonical! 
canonical-pc-linux 2016-03-07 4.4.0-10-1 canonical! 
Reboot to use ubuntu-core version 16.04.0-25.
Reboot to use canonical-pc-linux version 4.4.0-10-1.
ubuntu@snappy-1604-edge-amd64:~$ sudo reboot