diff --git a/README.adoc b/README.adoc
index 6b44e7a..9f61be5 100644
--- a/README.adoc
+++ b/README.adoc
@@ -5,9 +5,9 @@ The script executes the steps documented in link:http://docs.opennms.org/opennms
 
 The script is tested with:
 
-* Ubuntu 16.04 (Xenial Xerus) LTS 64bit
-* Debian 8 (Jessie) 64bit
-* CentOS 7.1 64bit
+* Ubuntu 18.04 (Bionic Beaver) 64bit
+* Debian 9 (Stretch) 64bit
+* CentOS 7.5.1804 64bit
 
 == Usage
 
diff --git a/bootstrap-debian-dev.sh b/bootstrap-debian-dev.sh
index e5f5167..1b81cca 100644
--- a/bootstrap-debian-dev.sh
+++ b/bootstrap-debian-dev.sh
@@ -32,6 +32,37 @@ usage() {
   echo "-h: Show this help"
 }
 
+checkRequirements() {
+  # Test if system is supported
+  uname -a | grep -E "${REQUIRED_SYSTEMS}"  1>/dev/null 2>>"${ERROR_LOG}"
+  if [ ! "${?}" -eq 0 ]; then
+    echo ""
+    echo "This is system is not a supported Ubuntu or Debian system."
+    echo ""
+    exit ${E_UNSUPPORTED}
+  fi
+
+  # Setting Postgres User and changing configuration files require
+  # root permissions.
+  if [ "${USER}" != "${REQUIRED_USER}" ]; then
+    echo ""
+    echo "This script requires root permissions to be executed."
+    echo ""
+    exit ${E_BASH}
+  fi
+
+  # The sudo command is required to switch to postgres user for DB setup
+  echo -n "Path to sudo: ">>${ERROR_LOG}
+  which sudo 1>>${ERROR_LOG} 2>>${ERROR_LOG}
+  if [ ! "${?}" -eq "0" ]; then
+    echo ""
+    echo "This script requires sudo which could not be found."
+    echo "Please install the sudo package."
+    echo ""
+    exit ${E_BASH}
+  fi
+}
+
 showDisclaimer() {
   echo ""
   echo "This script installs OpenNMS on  your system. It will"
@@ -66,24 +97,6 @@ showDisclaimer() {
   shopt -u nocasematch
 }
 
-# Test if system is supported
-uname -a | grep -E ${REQUIRED_SYSTEMS}  1>/dev/null 2>>${ERROR_LOG}
-if [ ! ${?} -eq 0 ]; then
-  echo ""
-  echo "This is system is not a supported Ubuntu or Debian system."
-  echo ""
-  exit ${E_UNSUPPORTED}
-fi
-
-# Setting Postgres User and changing configuration files require
-# root permissions.
-if [ "${USER}" != "${REQUIRED_USER}" ]; then
-  echo ""
-  echo "This script requires root permissions to be executed."
-  echo ""
-  exit ${E_BASH}
-fi
-
 ####
 # The -r option is optional and allows to set the release of OpenNMS.
 # The -m option allows to overwrite the package repository server.
@@ -206,6 +219,8 @@ cloneCode() {
 
 # Execute setup procedure
 clear
+showDisclaimer
+checkRequirements
 installOnmsRepo
 installOracleJdk
 installPostgres
diff --git a/bootstrap-debian.sh b/bootstrap-debian.sh
index 311becb..86ed9be 100644
--- a/bootstrap-debian.sh
+++ b/bootstrap-debian.sh
@@ -32,6 +32,37 @@ usage() {
   echo "-h: Show this help"
 }
 
+checkRequirements() {
+  # Test if system is supported
+  uname -a | grep -E "${REQUIRED_SYSTEMS}"  1>/dev/null 2>>"${ERROR_LOG}"
+  if [ ! "${?}" -eq 0 ]; then
+    echo ""
+    echo "This is system is not a supported Ubuntu or Debian system."
+    echo ""
+    exit ${E_UNSUPPORTED}
+  fi
+
+  # Setting Postgres User and changing configuration files require
+  # root permissions.
+  if [ "${USER}" != "${REQUIRED_USER}" ]; then
+    echo ""
+    echo "This script requires root permissions to be executed."
+    echo ""
+    exit ${E_BASH}
+  fi
+
+  # The sudo command is required to switch to postgres user for DB setup
+  echo -n "Path to sudo: ">>${ERROR_LOG}
+  which sudo 1>>${ERROR_LOG} 2>>${ERROR_LOG}
+  if [ ! "${?}" -eq "0" ]; then
+    echo ""
+    echo "This script requires sudo which could not be found."
+    echo "Please install the sudo package."
+    echo ""
+    exit ${E_BASH}
+  fi
+}
+
 showDisclaimer() {
   echo ""
   echo "This script installs OpenNMS on  your system. It will"
@@ -77,24 +108,6 @@ showDisclaimer() {
   shopt -u nocasematch
 }
 
-# Test if system is supported
-uname -a | grep -E "${REQUIRED_SYSTEMS}"  1>/dev/null 2>>"${ERROR_LOG}"
-if [ ! "${?}" -eq 0 ]; then
-  echo ""
-  echo "This is system is not a supported Ubuntu or Debian system."
-  echo ""
-  exit ${E_UNSUPPORTED}
-fi
-
-# Setting Postgres User and changing configuration files require
-# root permissions.
-if [ "${USER}" != "${REQUIRED_USER}" ]; then
-  echo ""
-  echo "This script requires root permissions to be executed."
-  echo ""
-  exit ${E_BASH}
-fi
-
 ####
 # The -r option is optional and allows to set the release of OpenNMS.
 # The -m option allows to overwrite the package repository server.
@@ -258,6 +271,7 @@ lockdownDbUser() {
 
 # Execute setup procedure
 clear
+checkRequirements
 showDisclaimer
 installOnmsRepo
 installPostgres
diff --git a/bootstrap-yum.sh b/bootstrap-yum.sh
index ca09b2f..c8ead82 100644
--- a/bootstrap-yum.sh
+++ b/bootstrap-yum.sh
@@ -33,6 +33,37 @@ usage() {
   echo "-h: Show this help"
 }
 
+checkRequirements() {
+  # Test if system is supported
+  cat ${RELEASE_FILE} | grep -E ${REQUIRED_SYSTEMS}  1>/dev/null 2>>${ERROR_LOG}
+  if [ ! ${?} -eq 0 ]; then
+    echo ""
+    echo "This is system is not a supported CentOS or Red Hat."
+    echo ""
+    exit ${E_UNSUPPORTED}
+  fi
+
+  # Setting Postgres User and changing configuration files require
+  # root permissions.
+  if [ "${USER}" != "${REQUIRED_USER}" ]; then
+    echo ""
+    echo "This script requires root permissions to be executed."
+    echo ""
+    exit ${E_BASH}
+  fi
+
+  # The sudo command is required to switch to postgres user for DB setup
+  echo -n "Path to sudo: ">>${ERROR_LOG}
+  which sudo 1>>${ERROR_LOG} 2>>${ERROR_LOG}
+  if [ ! "${?}" -eq "0" ]; then
+    echo ""
+    echo "This script requires sudo which could not be found."
+    echo "Please install the sudo package."
+    echo ""
+    exit ${E_BASH}
+  fi
+}
+
 showDisclaimer() {
   echo ""
   echo "This script installs OpenNMS on  your system. It will"
@@ -78,24 +109,6 @@ showDisclaimer() {
   shopt -u nocasematch
 }
 
-# Test if system is supported
-cat ${RELEASE_FILE} | grep -E ${REQUIRED_SYSTEMS}  1>/dev/null 2>>${ERROR_LOG}
-if [ ! ${?} -eq 0 ]; then
-  echo ""
-  echo "This is system is not a supported CentOS or Red Hat."
-  echo ""
-  exit ${E_UNSUPPORTED}
-fi
-
-# Setting Postgres User and changing configuration files require
-# root permissions.
-if [ "${USER}" != "${REQUIRED_USER}" ]; then
-  echo ""
-  echo "This script requires root permissions to be executed."
-  echo ""
-  exit ${E_BASH}
-fi
-
 ####
 # The -r option is optional and allows to set the release of OpenNMS.
 # The -m option allows to overwrite the package repository server.
@@ -247,6 +260,7 @@ restartOnms() {
 
 # Execute setup procedure
 clear
+checkRequirements
 showDisclaimer
 installOnmsRepo
 installOnmsApp