ubuntu@leo-test-server:~$ sudo apt update
sudo: unable to resolve host leo-test-server
Hit:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
Hit:2 http://archive.ubuntu.com/ubuntu xenial-proposed InRelease
Hit:3 http://nova.clouds.archive.ubuntu.com/ubuntu xenial InRelease
Hit:4 http://nova.clouds.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:5 http://nova.clouds.archive.ubuntu.com/ubuntu xenial-backports InRelease
Reading package lists... Done                     
Building dependency tree       
Reading state information... Done
98 packages can be upgraded. Run 'apt list --upgradable' to see them.
ubuntu@leo-test-server:~$ sudo apt install snapcraft
sudo: unable to resolve host leo-test-server
Reading package lists... Done
Building dependency tree       
Reading state information... Done
snapcraft is already the newest version (2.9).
0 upgraded, 0 newly installed, 0 to remove and 98 not upgraded.