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I have an instance of Ubuntu x64 16.04 guest running on a Windows 10 x64 Host. If I leave it running for an hour or two, it seems to lock and I can't get it to respond. I'm typically running it in as a normal window or full screen mode, not as scaled mode or seamless mode. I am running it with 3 virtual screens. I've clicking on the Ubuntu screen and waving the mousepointer around. I've also tried sending Ctrl+Alt+Del to it via the Input menu and with the Host+Del button. The screen just remains black until I power off the virtual machine.

I have all the power suspend, etc. settings turned off as far as I can figure out. The UI for the powersettings is kind of confusing.

Ubuntu Brightness & Lock

I don't see a way to turn off the Turn off screen when inactive for: 5 minutes.

There's nothing visual that changes when you toggle the lock setting on and off, but since the Lock screen after is disabled, so I would assume that it's off.

Here are my power settings:

Ubuntu Power Settings

Here are my Security and Privacy settings:

Ubuntu Security and Privacy Settings

  • Have you tried pressing the VM's power button to see if it will wake? Also, you can try sending Ubuntu Alt-SysRq-b to see if the kernel is still responding (which is the equivalent of pulling the plug, but since you're killing the VM anyway it's no worse). – dsstorefile1 May 4 '18 at 23:09
  • Where is the VM's power button? I see the Start button on Virtual Box manager. I've clicked it when the machine was unresponsive, but it didn't do anything. – Eric May 8 '18 at 20:34
  • The power button is the ACPI power off/shutdown option in one of the menus of the running VM's window. Keyword is ACPI. – dsstorefile1 May 8 '18 at 22:04

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