diff --git a/config/hostapd.conf b/config/hostapd.conf
index cdb2a881..b88b5469 100644
--- a/config/hostapd.conf
+++ b/config/hostapd.conf
@@ -20,5 +20,5 @@ country_code=GB
 ## RaspAP wireless client AP mode
 #interface=uap0
 
-## RaspAP bridge AP mode (disabled by default)
+## RaspAP bridge AP mode, disabled by default
 #bridge=br0
diff --git a/includes/dhcp.php b/includes/dhcp.php
index 40570bbb..72601374 100755
--- a/includes/dhcp.php
+++ b/includes/dhcp.php
@@ -187,12 +187,14 @@ function updateDnsmasqConfig($iface,$status)
     }
     //  Static leases
     $staticLeases = array();
-    for ($i=0; $i < count($_POST["static_leases"]["mac"]); $i++) {
-        $mac = trim($_POST["static_leases"]["mac"][$i]);
-        $ip  = trim($_POST["static_leases"]["ip"][$i]);
-        $comment  = trim($_POST["static_leases"]["comment"][$i]);
-        if ($mac != "" && $ip != "") {
-            $staticLeases[] = array('mac' => $mac, 'ip' => $ip, 'comment' => $comment);
+    if (isset($_POST["static_leases"]["mac"])) {
+        for ($i=0; $i < count($_POST["static_leases"]["mac"]); $i++) {
+            $mac = trim($_POST["static_leases"]["mac"][$i]);
+            $ip  = trim($_POST["static_leases"]["ip"][$i]);
+            $comment  = trim($_POST["static_leases"]["comment"][$i]);
+            if ($mac != "" && $ip != "") {
+                $staticLeases[] = array('mac' => $mac, 'ip' => $ip, 'comment' => $comment);
+            }
         }
     }
     //  Sort ascending by IPs
diff --git a/includes/functions.php b/includes/functions.php
index 35d285cf..7618eeb2 100755
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -52,11 +52,15 @@ function mask2cidr($mask)
  */
 function cidr2mask($cidr)
 {
-    $ta = substr ($cidr, strpos ($cidr, '/') + 1) * 1;
-    $netmask = str_split (str_pad (str_pad ('', $ta, '1'), 32, '0'), 8);
-    foreach ($netmask as &$element)
-      $element = bindec ($element);
-    return join ('.', $netmask);
+    $ipParts = explode('/', $cidr);
+    $ip = $ipParts[0];
+    $prefixLength = $ipParts[1];
+
+    $ipLong = ip2long($ip);
+    $netmaskLong = bindec(str_pad(str_repeat('1', $prefixLength), 32, '0'));
+    $netmask = long2ip($netmaskLong);
+
+    return $netmask;
 }
 
 /**
diff --git a/installers/common.sh b/installers/common.sh
index d7a046af..ade4e546 100755
--- a/installers/common.sh
+++ b/installers/common.sh
@@ -140,7 +140,13 @@ function _get_linux_distro() {
 # Sets php package option based on Linux version, abort if unsupported distro
 function _set_php_package() {
     case $RELEASE in
-        22.04|20.04|18.04|19.10|11*) # Ubuntu Server, Debian 11 & Armbian 22.05
+        23.05|12*) # Debian 12 & Armbian 23.05
+            php_package="php8.2-cgi"
+            phpcgiconf="/etc/php/8.2/cgi/php.ini" ;;
+        23.04) # Ubuntu Server 23.04
+            php_package="php8.1-cgi"
+            phpcgiconf="/etc/php/8.1/cgi/php.ini" ;;
+        22.04|20.04|18.04|19.10|11*) # Previous Ubuntu Server, Debian & Armbian distros
             php_package="php7.4-cgi"
             phpcgiconf="/etc/php/7.4/cgi/php.ini" ;;
         10*|11*)
@@ -165,6 +171,8 @@ function _set_php_package() {
 function _manage_systemd_services() { 
     _install_log "Checking for systemd network services"
 
+    _check_notify_ubuntu
+
     services=( "systemd-networkd" "systemd-resolved" )
     for svc in "${services[@]}"; do
         # Prompt to disable systemd service
@@ -189,10 +197,27 @@ function _manage_systemd_services() {
     _install_status 0
 }
 
+# Notifies Ubuntu users of pre-install requirements
+function _check_notify_ubuntu() {
+    if [ ${OS,,} = "ubuntu" ]; then
+        _install_status 2 "Ubuntu Server requires manual pre- and post-install steps. See https://docs.raspap.com/manual/"
+        echo -n "Proceed with installation? [Y/n]: "
+        read answer < /dev/tty
+        if [ "$answer" != "${answer#[Nn]}" ]; then
+            echo "Installation aborted."
+            exit 0
+        else
+            _install_status 0
+        fi
+    fi
+}
+
 # Runs a system software update to make sure we're using all fresh packages
 function _install_dependencies() {
     _install_log "Installing required packages"
     _set_php_package
+
+    # OS-specific packages
     if [ "$php_package" = "php7.4-cgi" ] && [ ${OS,,} = "ubuntu" ] && [[ ${RELEASE} =~ ^(22.04|20.04|18.04|19.10|11) ]]; then
         echo "Adding apt-repository ppa:ondrej/php"
         sudo apt-get install -y software-properties-common || _install_status 1 "Unable to install dependency"
@@ -203,10 +228,14 @@ function _install_dependencies() {
     if [ ${OS,,} = "debian" ] || [ ${OS,,} = "ubuntu" ]; then
         dhcpcd_package="dhcpcd5"
     fi
+    if [ ${OS,,} = "ubuntu" ]; then
+        iw_package="iw"
+    fi
+
     # Set dconf-set-selections
     echo iptables-persistent iptables-persistent/autosave_v4 boolean true | sudo debconf-set-selections
     echo iptables-persistent iptables-persistent/autosave_v6 boolean true | sudo debconf-set-selections
-    sudo apt-get install -y lighttpd git hostapd dnsmasq iptables-persistent $php_package $dhcpcd_package vnstat qrencode || _install_status 1 "Unable to install dependencies"
+    sudo apt-get install -y lighttpd git hostapd dnsmasq iptables-persistent $php_package $dhcpcd_package $iw_package vnstat qrencode || _install_status 1 "Unable to install dependencies"
     _install_status 0
 }