I have tried to turn off VT or just having it on. It will eventually come back though. This problem has been going on for a while now. I was on Ubuntu 12.04 but now 14.04 beyond that nothing else changed.Hi all,I'm not sure if someone has already asked this question. I have a 64 bit host that I have VT enabled in the BIOS. I can sometime create/run 64 bit guest machines and other times not. It is usually when I reboot my computer.