---

wget http://ftp.debian.org/debian/pool/main/d/debian-archive-keyring/debian-archive-keyring_2019.1+deb10u2_all.deb
или
http://mirror.batstateu.edu.ph/debian/pool/main/d/debian-archive-keyring/debian-archive-keyring_2019.1+deb10u2_all.deb

sudo dpkg -i debian-archive-keyring_2019.1+deb10u2_all.deb


echo "deb http://deb.debian.org/debian buster main contrib non-free" | sudo tee /etc/apt/sources.list.d/debian.list
echo "deb http://security.debian.org/debian-security buster/updates main contrib non-free" | sudo tee -a /etc/apt/sources.list.d/debian.list