Linux Mint 19.1 as guest on Virtualbox 60

Same steps as this post, but no need to add repos:
https://blog.thefoleyhouse.co.uk/2018/10/ubuntu-1804-bionic-beaver-as-virtualbox.html

Essentially:

• sudo apt update
• sudo apt install virtualbox-guest-utils virtualbox-guest-dkms dkms linux-headers-generic build essential