I had the same Problem with Rp4 and Docker, its the same solutions like above…
My Solution for that
#Add dep Key
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 04EE7237B7D453EC 648ACFD622F3D138
#Add dep
sudo echo 'deb http://httpredir.debian.org/debian buster-backports main contrib non-free' | sudo tee -a /etc/apt/sources.list.d/debian-backports.list
#Update and Install
sudo apt update
sudo apt install libseccomp2 -t buster-backports
Thats works for me