ubuntu@15-89:~$ sudo apt install snapd
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  snapd
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 9,706 kB of archives.
After this operation, 57.9 MB of additional disk space will be used.
Get:1 http://br.archive.ubuntu.com/ubuntu xenial-updates/main amd64 snapd amd64 2.25 [9,706 kB]
Fetched 9,706 kB in 0s (70.1 MB/s)
Selecting previously unselected package snapd.
(Reading database ... 59808 files and directories currently installed.)
Preparing to unpack .../archives/snapd_2.25_amd64.deb ...
Unpacking snapd (2.25) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up snapd (2.25) ...

ubuntu@15-89:~$ snap list
No snaps are installed yet. Try "snap install hello-world".

ubuntu@15-89:~$ snap install hello-world
error: access denied (try with sudo)

ubuntu@15-89:~$ sudo snap install hello-world
2017-08-03T18:39:15Z INFO cannot auto connect core:core-support-plug to core:core-support: (slot auto-connection), existing connection state "core:core-support-plug core:core-support" in the way
hello-world 6.3 from 'canonical' installed