Answers to some of your questions: Can you only get this on one particular host (i.e. hardware type)? - No as I can repro in KVM
-Is there anything in syslog? - Nothing relevant Which packages (dpkg -l | grep qemu) ii qemu-utils 2.0.0+dfsg-2ubuntu1.6 amd64 QEMU utilities Does a reboot (without installing new packages) fix the problem? - No -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1387881 Title: qemu fails to recognize full virtualization To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1387881/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
