diff --git a/install.sh b/install.sh
index e808cb6..228d81f 100644
--- a/install.sh
+++ b/install.sh
@@ -8,8 +8,9 @@ which sudo >/dev/null 2>&1 || su -c "sed -i '/cdrom/d' /etc/apt/sources.list ; a
 if ! id | grep -q '(sudo)' 
 then
   su -c "/usr/sbin/usermod -a -G sudo ${USER}"
-  # use sudo group without 
-  exec sg sudo
+  # use sudo group and restart this script 
+  sg sudo -c $0
+  exit $?
 fi