Parrot disk errors - timeout during server version negotiating

[jofitz81]

Errors can be introduced onto a Parrot disk (in my case after a failed parrot provision when trying to add a large database):

The following SSH command responded with a non-zero exit status.
Vagrant assumes that this means the command failed!

echo; printf $SSH_AUTH_SOCK

An error occurred in the underlying SSH library that Vagrant uses.
The error message is shown below. In many cases, errors from this
library are caused by ssh-agent issues. Try disabling your SSH
agent or removing some keys and try again.

If the problem persists, please report a bug to the net-ssh project.

timeout during server version negotiating

This can be resolved as follows:

1. download an Ubuntu disk image (e.g. ubuntu-14.04.4-server-amd64.iso)
2. add the disk image as a CD drive on the parrot virtual machine
3. boot from the CD drive (press F12 on startup)
4. select Rescue option and (eventually) getting to a terminal prompt
5. unmount /dev/sda1 (if it is mounted) - umount /dev/sda1
6. repair errors - fsck.ext4 /dev/sda1
7. on host machine: parrot restart