System Failure

No Matching Host Key

The version of OpenSSH included in 16.04 disables ssh-dss. There's a neat page with legacy information that includes this issue: http://www.openssh.com/legacy.html

$ ssh TCM@10.10.92.30                                       
Unable to negotiate with 10.10.92.30 port 22: no matching host key type found. Their offer: ssh-rsa,ssh-dss

Use the following option to the SSH command.

ssh -oHostKeyAlgorithms=+ssh-dss USER@IP

You can also add a host pattern in your ~/.ssh/config so you don't have to specify the key algorithm every time:

Host nas
  HostName 192.168.8.109
  HostKeyAlgorithms=+ssh-dss

This has the added benefit that you don't need to type out the IP address. Instead, ssh will recognize the host nas and know where to connect to. Of course you can use any other name in its stead.

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Vboxdrv not found

FATAL: Module vboxdrv not found in directory /lib/modules/4.10.0-20-generic

Fix:

sudo apt update
sudo apt install --reinstall linux-headers-$(uname -r) virtualbox-dkms dkms
sudo modprobe vboxdrv