diff --git a/install_full/ubuntu/airtime-full-install b/install_full/ubuntu/airtime-full-install
index 0ca25113a..8989736c4 100755
--- a/install_full/ubuntu/airtime-full-install
+++ b/install_full/ubuntu/airtime-full-install
@@ -25,7 +25,9 @@ echo "----------------------------------------------------"
 dist=`lsb_release -is`
 
 if [ "$dist" = "Debian" ]; then
+    set +e
     grep "deb http://www.deb-multimedia.org squeeze main non-free" /etc/apt/sources.list
+    set -e
     if [ "$?" -ne "0" ]; then
         echo "deb http://www.deb-multimedia.org squeeze main non-free" >> /etc/apt/sources.list
     fi