Black screen in Ubuntu vm (hyper-v inactive)

Discussions related to using VirtualBox on Windows hosts.
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Houzourix
Posts: 2
Joined: 24. Mar 2023, 16:35

Black screen in Ubuntu vm (hyper-v inactive)

Post by Houzourix »

Hi folks, I'm also getting a black-screen after the Ubuntu VM boot in a win10 host. I've tried solutions found in the forum, including
HMR3Init: Attempting fall back to NEM (Hyper-V is active)
Postby scottgus1 » 11. Aug 2020, 15:24

If your log contains these lines:

{timestamp} HM: HMR3Init: Attempting fall back to NEM: VT-x is not available
{timestamp} NEM: WHvCapabilityCodeHypervisorPresent is TRUE, so this might work...

or

{timestamp} HM: HMR3Init: Attempting fall back to NEM: AMD-V is not available
{timestamp} NEM: WHvCapabilityCodeHypervisorPresent is TRUE, so this might work...
My display settings are:
video memory 128MB
graphics controller VMSVGA
acceleration 3d

running a Virtual Box Version 6.1.18 r142142 (Qt5.6.2)
and a Ubuntu-19.10 64bit


I'm attaching the log, I appreciate the help :D
Attachments
Ubuntu-19.10-2023-03-24-15-32-55.zip
VM log
(37.12 KiB) Downloaded 1 time
scottgus1
Site Moderator
Posts: 20965
Joined: 30. Dec 2009, 20:14
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Windows, Linux

Re: Black screen in Ubuntu vm (hyper-v inactive)

Post by scottgus1 »

Ubuntu is known to go blackscreen if there is not enough free disk space to start the desktop environment. This happens in real PCs too. The solution is to log on text-only and delete stuff until the desktop environment can start. Web-search how to fix this in an Ubuntu PC and apply the steps to the VM. Also see How to Resize a Drive

Alternatively, try toggling the Fullscreen setting (HostKey + F).
Houzourix
Posts: 2
Joined: 24. Mar 2023, 16:35

Re: Black screen in Ubuntu vm (hyper-v inactive)

Post by Houzourix »

Thanks a bunch @scottgus1 , this solved it! I entered the root prompt from the recovery menu, deleted some folders and voilà !! gui back on.
scottgus1
Site Moderator
Posts: 20965
Joined: 30. Dec 2009, 20:14
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Windows, Linux

Re: Black screen in Ubuntu vm (hyper-v inactive)

Post by scottgus1 »

Great! Glad you're up and running.
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