Today, when I tried to boot up my linux virtualbox, I got this error:

C:\home\linux>vagrant up
Bringing machine 'default' up with 'virtualbox' provider... Your VM has become "inaccessible." Unfortunately, this is a critical error with VirtualBox that Vagrant can not cleanly recover from. Please open VirtualBox and clear out your inaccessible virtual machines or find a way to fix them.

That doesn’t sound good. A bit of googling around let me to this solution., which I’ll break down into the steps that worked for me.

In my “C:\Users{user}\VirtualBox VMs{vm-id}” folder are two files

• {vm-id}.vbox-prev
• {vm-id}.vbox-tmp

Renaming “{vm-id}.vbox-tmp” to “{vm-id}.vbox”

Then try running “vagrant up”

BOOM. It was that easy.