I have tried running VirtualBox 5 on Ubuntu 16.04 LTS on three machines with Core 2 CPUs (specifically, E7300, L7500 and L9400). On all three machines I have attached Ubuntu 16.04 LTS ISO as a boot device to install Ubuntu as a host OS. On all three machines this resulted in VirtualBox crashing in the same way: it displays a dialog box saying
Guru Meditation
A critical error has occurred while running the virtual machine and machine execution has been stopped.
[...]
Press OK if you want to power off the machine of press Ignore if you want to leave it as for debugging. Please note that debugging requires special knowledge and tools, so it is recommended to press OK now.
at which point the whole graphical desktop hangs and I have to switch to console and kill VirtualBox via htop.
I suspect that these systems do not pass some unspecified system requirements. If so, what are they, exactly? I thought a CPU with VT-x would suffice, at least. While E7300 doesn't have VT-x, L7500 and L9400 do.
Here's the logs. Here's the screenshot (it's pitch black):
VirtualBox site moderator suggests this is a question relevant to Ubuntu, not VirtualBox because this version of VirtualBox is provided by Ubuntu.
kvm-okcommand on them. The result will show existence of hardware virtualisation. I have testedkvmon Atoms and Celerons without VT-x. It will work, but very slow. You can try to setup VirtualBox to use software acceleration (see this answer for corresponding screenshots). Also you can read VirtualBox docs - sec. 3.5.3 and 10.3. – N0rbert Aug 04 '18 at 16:20