virtualbox.org

My system Acer 7740G laptop I5 CPU. Virtualbox version 5.0.16r 105871

It was all working fine until in installed Guest Additions, now I have no mouse and keyboard so cannot login. As I have very little knowledge Virtualbox and Debian I’m stuck as to what to do next.
I have tried switch off bits in Setting but did not help, I have tried the recovery Mode but do not know which commands to use to uninstall Guest Additions, Can anyone help.

Dubious. More likely is that you have defined a blank USB filter or two, and that is responsible from grabbing keyboard or mouse. Installing the Guest Additions would have no effect on USB, but installing the extension pack would.

Please post a VM log file. With the VM fully shut down, right click and "Show Log" in the GUI, save "VBox.log" (ONLY) to a zip, and attach the zip here.

I have attached VBox.log. Its looks like the problem is with the kernel when I run systemctl [systemd-modules-load.service loaded failed failed load kernel modules] I do not know how to fix this error.

Can anyone help.

In future when I ask for "VBox.log (ONLY)", please provide only what I ask for, because I really don't enjoy having my expected workload quadrupled when I'm not being paid for my work!

The question in your topic title is moot because I find no evidence that the Guest Additions have been installed (the GAs ISO is mounted in the VM, but the installer has not been run). On the other hand the extension pack is installed. This increases my confidence that the answer I already gave you is correct: look for filters defined in the USB section of the VM settings, and delete those filters. Don't add them back before explaining why you need them.

p.s. On an unrelated note. If I was you I'd reduce the RAM allocation to the VM to 2GB, as your host can't really afford 3GB.