Ubuntu Stopped Working

Discussions related to using VirtualBox on Windows hosts.
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Wondario
Posts: 6
Joined: 13. Jul 2020, 13:35

Ubuntu Stopped Working

Post by Wondario »

Hi, I'm running W10 and have an Ubuntu VB. It was working fine. I have done two things.

1.) I experimented with Docker. I used this guide:

https://ubuntu.com/tutorials/windows-ub ... containers

2.) I updated VirtualBox to the latest version 6.1.22.

I didn't change any Windows Features when I was playing with Docker.

Now Ubuntu starts up and gets I think all the way to the log in screen, except instead of the login screen I now just see a black screen with a blinking underscore in the top left corner.

Any ideas what I should try?
scottgus1
Site Moderator
Posts: 20965
Joined: 30. Dec 2009, 20:14
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Windows, Linux

Re: Ubuntu Stopped Working

Post by scottgus1 »

Wondario wrote:I experimented with Docker.
Docker enables Hyper-V, and Hyper-V interferes with Virtualbox in many situations.

Please right-click the VM in the main Virtualbox window's VM list, choose Show Log.

Search the far left tab's log for this text:

Attempting fall back to NEM

If you find it, Hyper-V is enabled and needs to be disabled. See HMR3Init: Attempting fall back to NEM (Hyper-V is active).

If you don't find that text, save the far left tab's log, zip the log file, and post the zip file, using the forum's Upload Attachment tab.
Wondario
Posts: 6
Joined: 13. Jul 2020, 13:35

Re: Ubuntu Stopped Working

Post by Wondario »

Did the search, found your search string.

My Hyper-V in Windows settings was off but if you went to systeminfo.exe it was still on. Had to follow this guide:

https://petri.com/how-to-disable-hyper- ... windows-10

to turn it completely off. Everything works fine now. Thanks!
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