Stop Stuck Virtual Box Instance

Recently one of my Virtual Box instances was stuck in the “Stopping” mode and no matter what I did, it would not fully stop. Thankfully, after some digging, this command came in handy.

killall -9 VBoxHeadless

The -9 here is a signal which equates to:

9       KILL (non-catchable, non-ignorable kill)

Cheers.