diff --git a/install.sh b/install.sh
index 4ce15e0..652d63e 100644
--- a/install.sh
+++ b/install.sh
@@ -4,7 +4,14 @@ set -e
 
 # on fresh install remove cdrom-repo and install sudo if not available
 which sudo >/dev/null 2>&1 || su -c "sed -i '/cdrom/d' /etc/apt/sources.list ; apt update ; apt -y install sudo"
-id | grep -q '(sudo)' || su -c "/usr/sbin/usermod -a -G sudo ${USER}"
+# add user to sudo group it not
+if ! id | grep -q '(sudo)' 
+then
+  su -c "/usr/sbin/usermod -a -G sudo ${USER}"
+  # use sudo group and restart this script 
+  exec sg sudo -c "bash $0"
+  exit $?
+fi
 
 
 sudo apt-get -y install ansible git
@@ -17,6 +24,7 @@ rm -rf $(hostname -s)-git
 mkdir $(hostname -s)-git
 cd $(hostname -s)-git
 
+
 for playbook in \
  debian.ansible.basics \
  debian.ansible.runchecks \