@Bill (franksmcb) (franksmcb) 

This is a bit broader. VirtualBox is still affected. I use 5.1 because of 25 VMs inside it.

As I already wrote - see https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1796437/comments/16 :

> Norbert (nrbrtx) wrote on 2020-01-16
>
>Still reproducible on 20200115 and 20200116 builds.
>
>---
>
>Reproducible method 1:
>
>1. boot installation media
>2. select [o] Normal installation, [x] Download updates, [x] Install third-party software
>3. Wait installation to finish
>4. Boot the installed system, wait for Snappy unpacking/initialization/seeding (check from tty1 with `snap list`)
>5. Login to desktop session
>6. Get crash of whole Xorg after login when of Ubuntu MATE Welcome window is starting to appear.
>
>Reproducible method 2:
>
>1. boot installation media
>2. select [o] Normal installation, [ ] Download updates, [ ] Install third-party software
>3. Wait installation to finish
>4. Boot the installed system, wait for Snappy unpacking/initialization/seeding (check from tty1 with `snap list`)
>5. Install Ubuntu restricted extras with `sudo apt-get install ubuntu-restricted-extras` and reboot
>6. Login to desktop session
>7. Get crash of whole Xorg after login when of Ubuntu MATE Welcome window is starting to appear.
>
>Guest settings: choosing video acceleration disabled or 3d video acceleration does not change >behavior. Increasing VRAM from default 16 Mb to 128 Mb (max for my machine) does not help either.
>VirtualBox versions tested:
>
>* 5.1.38-dfsg-0ubuntu1.16.04.3 (from multiverse) - crash,
>* 5.0.40 (from Oracle) - crash,
>* 5.1.38 (from Oracle) - crash,
>* 5.2.36 (from Oracle) - crash,
>* 6.0.16 (from Oracle) - crash,
>* 6.1.2 (from Oracle) - crash.
>
>---
>
>Removing `ubuntu-mate-welcome` from autostart with `sudo rm /etc/xdg/autostart/ubuntu-mate-welcome-autostart.desktop` fixes the login issue. But direct launch of it with `ubuntu-mate-welcome` ends with another crash.

and https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1796437/comments/17  :

> Norbert (nrbrtx) wrote on 2020-01-18
>
>With virt-manager the crashes occur with Cirrus, QXL, VGA video drivers.
>But does not occur with VMVGA video driver.
>Possibly kernel (drm) issue.

and https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1796437/comments/19 :

> Norbert (nrbrtx) wrote on 2020-01-18
>
>I found the real reason for the crashes. The problematic package is the `gstreamer1.0-vaapi` (see https://packages.ubuntu.com/focal/gstreamer1.0-vaapi).
>It is a dependency of `ubuntu-restricted-addons` (see https://packages.ubuntu.com/focal/ubuntu-restricted-addons).
>
>So ubuntu-mate-welcome and for example Cheese may be fixed by removing this package with
>
>```
>sudo apt-get purge gstreamer1.0-vaapi
>sudo apt-get autoremove --purge # to remove libgstreamer-plugins-bad1.0-0 (is not a problem)
>```
>
>So please carefully analyze the crash dumps for errors in `gstreamer1.0-vaapi` and fix this package.

End of quotes.

I would recommend to test any modern VirtualBox (according to https://www.virtualbox.org/wiki/Download_Old_Builds this means >= 5.2) with non-VMVGA video driver to reproduce the issue. And report here the results.