Virtualbox guest:
https://askubuntu.com/a/917163
Once restarted add user to group:
nano /etc/group :add user name to end of vboxsf line (last in file normally)
Fix inability to write symlinks:
https://serverfault.com/questions/345341/cant-create-symlinks-in-virtualbox-shared-folders
VBoxManage setextradata VM_NAME VBoxInternal2/SharedFoldersEnableSymlinksCreate/SHARE_NAME 1
MUST restart the VirtualBox GUI and instance.
Setup for ssh from you mac: https://stackoverflow.com/a/10532299/9267580
ssh -p 3022 ... vbox-username@127.0.0.1