Create sources.list in a more reliable way

src/freedombone

     echo 'search_for_attached_usb_drive' >> $COMPLETION_FILE
 }
 
-function remove_proprietary_repos {
-    if grep -Fxq "remove_proprietary_repos" $COMPLETION_FILE; then
-        return
-    fi
-    sed -i 's/ non-free//g' /etc/apt/sources.list
-    echo 'remove_proprietary_repos' >> $COMPLETION_FILE
-}
-
-function change_debian_repos {
-    if grep -Fxq "change_debian_repos" $COMPLETION_FILE; then
-        return
-    fi
-    if [[ $SYSTEM_TYPE == "$VARIANT_MESH" ]]; then
+function create_repo_sources {
+    if grep -Fxq "create_repo_sources" $COMPLETION_FILE; then
         return
     fi
     rm -rf /var/lib/apt/lists/*
     apt-get clean
-    sed -i "s/ftp.us.debian.org/$DEBIAN_REPO/g" /etc/apt/sources.list
 
-    # ensure that there is a security repo
-    if ! grep -q "security" /etc/apt/sources.list; then
-        echo "deb http://security.debian.org/ $DEBIAN_VERSION/updates main contrib" >> /etc/apt/sources.list
-        echo "#deb-src http://security.debian.org/ $DEBIAN_VERSION/updates main contrib" >> /etc/apt/sources.list
-    fi
+    echo "deb http://$DEBIAN_REPO/debian/ jessie main" > /etc/apt/sources.list
+    echo "deb-src http://ftp.uk.debian.org/debian/ jessie main" >> /etc/apt/sources.list
+    echo '' >> /etc/apt/sources.list
+    echo "deb http://security.debian.org/ jessie/updates main" >> /etc/apt/sources.list
+    echo "deb-src http://security.debian.org/ jessie/updates main" >> /etc/apt/sources.list
+    echo '' >> /etc/apt/sources.list
+    echo "deb http://$DEBIAN_REPO/debian/ jessie-updates main" >> /etc/apt/sources.list
+    echo "deb-src http://$DEBIAN_REPO/debian/ jessie-updates main" >> /etc/apt/sources.list
+    echo '' >> /etc/apt/sources.list
+    echo "deb http://$DEBIAN_REPO/debian/ jessie-backports main" >> /etc/apt/sources.list
+    echo "deb-src http://$DEBIAN_REPO/debian/ jessie-backports main" >> /etc/apt/sources.list
 
     apt-get update
     apt-get -y install apt-transport-https
-    echo 'change_debian_repos' >> $COMPLETION_FILE
+    
+    echo 'create_repo_sources' >> $COMPLETION_FILE
 }
 
 function initial_setup {
 configure_firewall_for_avahi
 configure_firewall_for_zeronet
 configure_firewall_for_ipfs
-remove_proprietary_repos
-change_debian_repos
+create_repo_sources
 enable_backports
 configure_dns
 initial_setup