Keyboard and mouse stopped working after routine guest additions upgrade

[bsobhani]

Host: Windows 10
Guest: Debian 8

I inserted the CD and installed guest additions and when I rebooted the guest machine, the keyboard and mouse do not work so I am unable to get past the login screen. However, I am able to use the keyboard when I boot into recovery mode. I tried uninstalling guest additions from recovery mode, but the uninstall.sh file in the /opt/VBoxGuestAdditions-5.2.8 folder is completely blank and is 0 bytes (although it is present). I know guestadditions was at least partially installed because full screen works, so I think if I can figure out how to uninstall it or disable it it may be a first step to getting my guest OS inputs working again. I tried mounting the guest additions cd image in recovery mode (in order to uninstall guest additions), but I am getting a "unknown filesystem type iso9660" error. I also have tried apt-get uninstall virtualbox*

How can I disable or remove guest additions when the guest additions uninstaller is not working?

[socratis]

We're going to need to see a VM log from a complete VM run:

• Start the VM from cold-boot (not from a paused or saved state) / Observe error / Shutdown the VM (force close it if you have to).
• With the VM completely shut down (not paused or saved), right-click on the VM in the VirtualBox Manager and select "Show Log".
• Save only the first "VBox.log", ZIP it and attach it to your response. See the "Upload attachment" tab below the reply form.