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.
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). restricted- addons` (see https:/ /packages. ubuntu. com/focal/ ubuntu- restricted- addons).
It is a dependency of `ubuntu-
So ubuntu-mate-welcome and for example Cheese 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.