Merge pull request #349 from dappnode/pablo/fix-preinstall

Improve preinstall script

scripts/dappnode_install_pre.sh

@@ -133,7 +133,7 @@ install_wireguard_dkms() {
     fi
 }
 
-# LSOF INSTALLATION   
+# LSOF INSTALLATION: used to scan host port 80 in use, https package installation will deppend on it  
 install_lsof() {
     apt-get update -y
     apt-get install lsof -y | tee -a $LOG_FILE
@@ -144,11 +144,11 @@ install_lsof() {
     fi
 }
 
-# IPTABLES INSTALLATION
+# IPTABLES INSTALLATION: mandatory for docker, on bullseye is not installed by default
 install_iptables () {
     apt-get update -y
     apt-get install iptables -y | tee -a $LOG_FILE
-    if  lsof -v >/dev/null 2>&1 ; then
+    if  iptables -v >/dev/null 2>&1 ; then
         echo -e "\e[32m \n\n Verified iptables installation \n\n \e[0m" 2>&1 | tee -a $LOG_FILE
     else
         echo -e "\e[31m \n\n WARNING: iptables not installed, Docker may not work! \n\n \e[0m" 2>&1 | tee -a $LOG_FILE