https://wiki.debian.org/LTS/Using#Using ... _.28LTS.29
states that /etc/apt/sources.list should contain these entries:
Code: Select all
deb http://deb.debian.org/debian/ jessie main contrib non-free
deb-src http://deb.debian.org/debian/ jessie main contrib non-free
deb http://security.debian.org/ jessie/updates main contrib non-free
deb-src http://security.debian.org/ jessie/updates main contrib non-free
deb http://deb.debian.org/debian/ jessie-updates main contrib non-free
deb-src http://deb.debian.org/debian/ jessie-updates main contrib non-free