diff --git a/installer.sh b/installer.sh
index b9407b3..67d2877 100644
--- a/installer.sh
+++ b/installer.sh
@@ -199,6 +199,7 @@ service sshd restart
 echo "root:$password" | chpasswd
 cd /tmp
 #mv /boot/grub/menu.lst /boot/grub/menu.lst.bck
+apt update #to avoid apt being unable to install software-properties-common
 apt install -y software-properties-common
 add-apt-repository -y ppa:certbot/certbot
 add-apt-repository -y ppa:ondrej/php