diff --git a/Perso/package_restore.sh b/Perso/package_restore.sh
old mode 100644
new mode 100755
index 84bd73d..7fad345
--- a/Perso/package_restore.sh
+++ b/Perso/package_restore.sh
@@ -1,11 +1,16 @@
 #! /bin/bash
 
-cp . /etc/apt/sources.list
-cp ./preferences.d/ /etc/apt/preferences.d/my_preferences
+if [ $(id -u) -ne "0" ]; then
+	echo "Please execute with superuser privileges"
+	exit -1
+fi
+
+cp ./sources.list /etc/apt/sources.list
+cp ./preferences.d/my_preferences /etc/apt/preferences.d/my_preferences
 cp -r ./sources.list.d/* /etc/apt/sources.list.d
 
 apt-get update
 apt-get install dselect
 dpkg --set-selections < "manual_package_save"
 apt-get dselect-upgrade
-apt-get remove dselect
+apt-get remove dselect
\ No newline at end of file
diff --git a/Perso/package_save.sh b/Perso/package_save.sh
index e31ee8e..25908b1 100755
--- a/Perso/package_save.sh
+++ b/Perso/package_save.sh
@@ -41,9 +41,14 @@ b="package_restore.sh"
 
 echo "#! /bin/bash" > $b
 echo "" >> $b
-echo cp . /etc/apt/sources.list >> $b
-echo cp ./preferences.d/ /etc/apt/preferences.d/my_preferences >> $b
-echo cp -r ./sources.list.d/* /etc/apt/sources.list.d >> $b
+echo 'if [ $(id -u) -ne "0" ]; then' >> $b
+echo '	 echo "Please execute with superuser privileges"' >> $b
+echo "	 exit -1" >> $b
+echo fi >> $b
+echo "" >> $b
+echo cp ./sources.list /etc/apt/sources.list >> $b
+echo cp ./preferences.d/my_preferences /etc/apt/preferences.d/my_preferences >> $b
+echo 'cp -r ./sources.list.d/* /etc/apt/sources.list.d' >> $b
 echo "" >> $b
 echo apt-get update >> $b
 echo apt-get install dselect >> $b
@@ -55,5 +60,4 @@ chmod u-x "$b"
 
 cd -
 
-exit
-
+exit
\ No newline at end of file