I need to recall that on QEMU/KVM (while using virt-manager the crashes occur with Cirrus, QXL, VGA video drivers, but does not occur with VMVGA video driver) and VirtualBox (tested all versions with default `vboxvideo` driver) the crash is caused by `gstreamer-vaapi` package (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 with Yelp 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.
I'm not sure about the bug inside `xorg-server` codebase.
I need to recall that on QEMU/KVM (while using virt-manager the crashes occur with Cirrus, QXL, VGA video drivers, but does not occur with VMVGA video driver) and VirtualBox (tested all versions with default `vboxvideo` driver) the crash is caused by `gstreamer-vaapi` package (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 with Yelp may be fixed by removing this package with
``` plugins- bad1.0- 0 (is not a problem)
sudo apt-get purge gstreamer1.0-vaapi
sudo apt-get autoremove --purge # to remove libgstreamer-
```
So please carefully analyze the crash dumps for errors in `gstreamer1. 0-vaapi` and fix this package.
I'm not sure about the bug inside `xorg-server` codebase.