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1. http://blog.netpacket.co.uk/2016/12/05/unlocking-ubuntu-server-16-encrypted-luks-using-dropbear-ssh/
   1. update: if the above link is not found, you can google search for "dropbear ssh ubuntu luks encryption" for the steps
2. After following the above steps, I create an entry called "unlock" in my ~/.ssh/config file on my Mac laptop.  So after I boot my Ubuntu 16.04 LTS Desktop VM (using the VirtualBox CLI), then I type 'ssh unlock', and type 'unlock' when presented with the busybox prompt.  I am prompted to enter a password to unlock the encrypted disk.  After that, the system will boot up, then I can ssh in remotely.
   

   Host unlock
     Hostname 192.168.56.101
     User root
     IdentityFile /Users/ksa/.ssh/id_rsa_ubuntu_unlock
     StrictHostKeyChecking no

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