diff --git a/bootstrap/_deb_common.sh b/bootstrap/_deb_common.sh
index cd9036581..1fc9babcc 100755
--- a/bootstrap/_deb_common.sh
+++ b/bootstrap/_deb_common.sh
@@ -38,11 +38,20 @@ AUGVERSION=`apt-cache show --no-all-versions libaugeas0 | grep ^Version: | cut -
 if dpkg --compare-version 1.0 gt "$AUGVERSION" ; then
     if lsb_release -a | grep -q wheezy ; then
         if ! grep -v -e ' *#' /etc/apt/sources.list | grep -q wheezy-backports ; then
-            # XXX ask for permission before doing this?
-            echo Installing augeas from wheezy-backports...
-            echo deb http://http.debian.net/debian wheezy-backports main >> /etc/apt/sources.list
-            apt-get update
-            apt-get install -y --no-install-recommends -t wheezy-backports libaugeas0
+            # This can theoretically error if sources.list.d is empty, but in that case we don't care.
+            if ! grep -v -e ' *#' /etc/apt/sources.list.d/* | grep -q wheezy-backports 2>/dev/null ; then
+                echo -n "Installing libaugeas0 from wheezy-backports in 3 seconds..."
+                sleep 1s
+                echo -e "\e[0K\rInstalling libaugeas0 from wheezy-backports in 2 seconds..."
+                sleep 1s
+                echo -e "\e[0K\rInstalling libaugeas0 from wheezy-backports in 1 second ..."
+                sleep 1s
+                echo '(Backports are only installed if explicitly requested via "apt-get install -t wheezy-backports")'
+
+                echo deb http://http.debian.net/debian wheezy-backports main >> /etc/apt/sources.list.d/wheezy-backports.list
+                apt-get update
+                apt-get install -y --no-install-recommends -t wheezy-backports libaugeas0
+            fi
         fi
         augeas_pkg=
     else