sudo cp -n /etc/apt/sources.list /etc/apt/sources.list.osmc-eol-backup
sudo sed -i -E '/bullseye-security/d' /etc/apt/sources.list
sudo sed -i '/^$/{N;/^\n$/D}' /etc/apt/sources.list
sudo sed -i '$a deb https://apt.osmc.tv bullseye-security main' /etc/apt/sources.list
sudo grep -c '^deb https://apt.osmc.tv bullseye-security main' /etc/apt/sources.list
sudo apt-get update