Fix Docker not being installed on Ubuntu 16.04
Fix Docker not being installed on Ubuntu 16.04

This only affects the default Docker version for 1.12 (18.06.3).

gambol99/kops,gambol99/kops,robinpercy/kops,aledbf/kops,justinsb/kops,justinsb/kops,aledbf/kops,aledbf/kops,gambol99/kops,kubernetes/kops,kubernetes/kops,robinpercy/kops,robinpercy/kops,robinpercy/kops,kubernetes/kops,gambol99/kops,justinsb/kops,aledbf/kops