DNS queries fail, while IP addresses work, after upgrade from Ubuntu 16.10 to 17.04 in VirtualBox

DNS queries fail, while IP addresses work, after upgrade from Ubuntu 16.10 to 17.04 in VirtualBox. Applied updates to 16.10 before upgrading to 17.04.

i.e. sudo apt update && sudo apt full-upgrade
except I did the update and upgrade via gui.