VM has become 'inaccessible' - Vagrant no longer working

Question

For some reason this morning when I run \'vagrant up\' I get the following error (this has worked absolutely fine for over a year)

Your VM has b         


        

Answer 1

On Linux the following will unregister the machines:

VBoxManage list vms
VBoxManage unregistervm 

After that you may want to restart VB services:

sudo /sbin/vboxconfig

Deleting .vagrant folder may help but you had to rebuild the machines.