When I try, I get this: root@kilo-VirtualBoxHost:~# virsh -c vbox:///session error: failed to connect to the hypervisor error: internal error: nsIEventQueue object is null ---------------------------------- The part that puzzles me is that it *used* to work, but no longer. "virsh -V" shows me running libvirt 1.2.2, with VirtualBox enabled. I'm running stock Ubuntu VirtualBox v. 4.3.10. I've rebooted; I've tried running it as different users. Googling comes up with some five-year-old Solaris patch discussions. My /var/log/libvirt/libvirtd.log shows stuff like this: 2015-11-25 02:21:39.381+0000: 3893: error : virNetSocketReadWire:1454 : End of file while reading data: Input/output error 2015-11-25 02:26:38.953+0000: 3897: error : vboxInitialize:932 : internal error: nsIEventQueue object is null 2015-11-25 02:26:38.954+0000: 3893: error : virNetSocketReadWire:1454 : End of file while reading data: Input/output error Any pointers would be greatly appreciated. Thanks! -Ken