Black screen after GUI login on Ubuntu with tools installed.

[MattF]

Hi

I'm running on virutalbox (6.1.6r137129) on Windows 10 and I have installed an Ubuntu 20.04 guest on the host. I have then installed the virtualbox guest additions on the guest.

The problem I have is that after bootup, the login window is displayed and I log in but then the screen goes totally black. If I then resize the window, the desktop appears

I'm not sure if this is a bug in virtualbox / guest additions or some sort of conflict with Ubuntu. I have tried this multiple times installing new version of Ubuntu and each time the problem re-occurs so for me it is repeatable.

Steps to reproduce:

1. Install Ubuntu 20.04 Guest OS (I gave it 128MB video memory, VMSVGA video, 3D acceleration enabled

2. Boot guest OS

3. Install guest additions (you'll need "build-essential" package installed too)

4. Reboot

5. Set guest to start up in full screen mode.

6. Login

<black screen>

7. Re-size guest window.

<image appears>

[BertiN45]

Same problem with 6.1.8. And it happens on all my Ubuntu guests from 16.04 to 20.04 and all Ubuntu familly members (Xubuntu, Ubuntu Mate etc.) that I did update from 6.1.4 to 6.1.8. As far as I remember the reboot after the update to 6.1.8 works.

I moved all my work to Vbox virtual machines and errors like this are very annoying! Fortunately it looks that pressing 2 x CTRL+F bypasses the problem, but the conky display is on the wrong location afterwards. I have to accept it or rollback approx 40 VM Guest Additions to 6.1.4.

[BertiN45]

I have tried VBoxGuestAdditions_6.1.7-137891 from the test builds on 7 distros and that works correctly

[BertiN45]

The next day VBoxGuestAdditions_6.1.7-137891 and those VMs failed again. It looks like it worked yesterday, but trying again today it failed. It could be caused because I rebooted the Host.

[Frank Batschulat (Oracle)]

Is your Ubuntu guest VM running Xwayland by any chance instead of Xorg?

[Feline]

Same external symptoms here when using Debian 10 guests with Mate desktop. Guests have always run full-screen but with both 6.1.6 and 6.1.8 GA's, fullscreen is broken - just a blank screen after login. Video is set to use VMSVGA and 3D acceleration is set off.

The GA's from 6.1.4 work correctly.

XDG session details are as follows :

XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0

XDG_SESSION_DESKTOP=lightdm-xsession

XDG_SESSION_TYPE=x11

XDG_SESSION_CLASS=user

XDG_SESSION_ID=2

[Feline]

Have just re-tested this with Guest Additions 6.1.9.138064 but the problem persists.

Environment details :

Host - Debian 10 Mate desktop

VirtualBox 6.1.8 r137981

Guests - Debian 10 Mate desktop

Guest Additions, either 6.1.8 or 6.1.9.138064

Note : Fullscreen can be restored by re-sizing guest window twice.

[Feline]

Seems to be similar/same problem as that reported in ticket https://www.virtualbox.org/ticket/19496

However, as stated above, latest test build of GA's (6.1.9.138064) does not fix problem.

[Harry M]

I found that switching VMSVGA to VboxSVGA (which is no longer supported!) corrects the problem.

[gombara]

I have just tried this with GA from the following link: https://www.virtualbox.org/download/testcase/VBoxGuestAdditions_6.1.13-140023.iso I could not reproduce this bug. Could you please replace your GAs with the one from this link and let us know if it works for you or not. Thanks

[eberhard]

I have the same problem with Ubuntu 18.04 as host machine and Ubuntu 20.04 as guest with VMSVGA graphics controller.

As a workaround I found that if I disable 3D acceleration things start to work again (with both VMSVGA and VboxSVGA).

[eberhard]

Replying to gombara:

I have just tried this with GA from the following link: https://www.virtualbox.org/download/testcase/VBoxGuestAdditions_6.1.13-140023.iso I could not reproduce this bug. Could you please replace your GAs with the one from this link and let us know if it works for you or not. Thanks

This fixes it for me. After installing guest additions 6.1.13 VMSVGA works for me even when I enable 3D acceleration.