On Mon, 2016-05-23 at 18:49 +0000, Alexander Tsamutali wrote: > root@ed69a0989664:/etc/apt# cat preferences.d/xscreensaver > Package: xscreensaver > Pin: origin n=jessie-updates > Pin-Priority: -1 That's not a valid pin definition. "origin" is a hostname, you want "Pin: release n=jessie-updates". Regards, Adam