Explanation: this file was installed by grml-live to allow installation of systemd/udev (required for systemd-container) from backports
Package: systemd libsystemd0 libpam-systemd libapparmor1 ifupdown systemd-sysv udev libudev1
Pin: release a=jessie-backports
Pin-Priority: 997

Explanation: this file was installed by grml-live to allow installation of linux-base (required for kernel packages) from backports
Package: linux-base firmware-misc-nonfree firmware-linux-nonfree firmware-linux
Pin: release a=jessie-backports
Pin-Priority: 997