Black screen, "A critical error has occurred while running the virtual machine'

[Dan Stromberg]

I have a virtual machine that I use pretty much daily, Monday through Friday. It's a Linux Mint 19.1 guest on a Linux Mint 19.1 host.

Yesterday it started having what seems to be a serious problem. The last thing I saw from it was a successful backup that completed at about 4:05AM, July 11, 2019.

By around 7:15AM, July 11, 2019, I could no longer ssh into it.

The "console" is just a black window that appears shortly after the grub menu.

I'm attaching the last 300 lines of my VBox.log, and VBox.png.

Does anyone know how I can make my virtual machine bootable again?

Thanks!
-----
Update:
I just tried to install a new virtual machine, and got the error again for it, again shortly after the grub menu. So I don't think it's something wrong in the guest. I was just trying to boot from linuxmint-19.1-cinnamon-64bit.iso .

The VBox.log is again too large to attach, but I've attached a compressed version of this one.

Thanks!

[socratis]

I'm attaching the last 300 lines of my VBox.log, and VBox.png.

Partial logs are not that helpful I'm afraid. We need to see a complete VBox.log, from a complete VM run, where the problem occurs:

• Start the VM from cold-boot (not from a paused or saved state) / Observe problem / 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.

[Dan Stromberg]

I posted a full log from a new virtual machine.

I just tried to uninstall virtualbox and reinstall it, but that didn't help.

Thanks.