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tail /etc/apt/sources.list
deb http://http.us.debian.org/debian/ jessie main
deb-src http://http.us.debian.org/debian/ jessie main
deb http://security.debian.org/ jessie/updates main
deb-src http://security.debian.org/ jessie/updates main
# jessie-updates, previously known as 'volatile'
deb http://http.us.debian.org/debian/ jessie-updates main
deb-src http://http.us.debian.org/debian/ jessie-updates main