+++ /dev/null
-#
-
-#deb http://mirror.cc.columbia.edu/debian/ buster main non-free contrib
-#deb-src http://mirror.cc.columbia.edu/debian/ buster main non-free contrib
-deb http://ftp.us.debian.org/debian/ buster main non-free contrib
-deb-src http://ftp.us.debian.org/debian/ buster main non-free contrib
-deb http://security.debian.org/debian-security buster/updates main contrib non-free
-deb-src http://security.debian.org/debian-security buster/updates main contrib non-free
-
-# updates, previously known as 'volatile'
-deb http://ftp.us.debian.org/debian/ buster-updates main contrib non-free
-deb-src http://ftp.us.debian.org/debian/ buster-updates main contrib non-free
-#deb http://mirror.cc.columbia.edu/debian/ stretch-updates main contrib non-free
-#deb-src http://mirror.cc.columbia.edu/debian/ stretch-updates main contrib non-free
-
-# backports, previously on backports.debian.org
-#deb http://mirror.cc.columbia.edu/debian/ stretch-backports main contrib non-free
-#deb-src http://mirror.cc.columbia.edu/debian/ stretch-backports main contrib non-free