diff --git a/tools/pve/scaling-governor.sh b/tools/pve/scaling-governor.sh
index 175012aaf..348f8e8aa 100644
--- a/tools/pve/scaling-governor.sh
+++ b/tools/pve/scaling-governor.sh
@@ -20,16 +20,26 @@ header_info() {
 EOF
 }
 header_info
-whiptail --backtitle "Proxmox VE Helper Scripts" --title "CPU Scaling Governors" --yesno "View/Change CPU Scaling Governors. Proceed?" 10 58
-current_governor=$(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor)
+whiptail --backtitle "Proxmox VE Helper Scripts" --title "CPU Scaling Governors" --yesno "View/Change CPU Scaling Governors. Proceed?" 10 58 || exit 0
+
+GOV_BASE="/sys/devices/system/cpu/cpu0/cpufreq"
+if [[ ! -r "$GOV_BASE/scaling_governor" || ! -r "$GOV_BASE/scaling_available_governors" ]]; then
+  whiptail --backtitle "Proxmox VE Helper Scripts" --title "CPU Scaling Not Available" \
+    --msgbox "CPU frequency scaling is not available on this system.\n\nThis is normal when no cpufreq driver is active (e.g. CPU power management handled by the BIOS, or certain virtualized hosts)." 12 70
+  clear
+  exit 0
+fi
+
+current_governor=$(cat "$GOV_BASE/scaling_governor")
 GOVERNORS_MENU=()
 MSG_MAX_LENGTH=0
 while read -r TAG ITEM; do
   OFFSET=2
   ((${#ITEM} + OFFSET > MSG_MAX_LENGTH)) && MSG_MAX_LENGTH=${#ITEM}+OFFSET
   GOVERNORS_MENU+=("$TAG" "$ITEM " "OFF")
-done < <(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors | tr ' ' '\n' | grep -v "$current_governor")
-scaling_governor=$(whiptail --backtitle "Proxmox VE Helper Scripts" --title "Current CPU Scaling Governor is set to $current_governor" --checklist "\nSelect the Scaling Governor to use:\n" 16 $((MSG_MAX_LENGTH + 58)) 6 "${GOVERNORS_MENU[@]}" 3>&1 1>&2 2>&3 | tr -d '"')
+done < <(tr ' ' '\n' <"$GOV_BASE/scaling_available_governors" | sed '/^$/d' | grep -vxF "$current_governor")
+# A radiolist is used on purpose: only a single governor can be active at a time.
+scaling_governor=$(whiptail --backtitle "Proxmox VE Helper Scripts" --title "Current CPU Scaling Governor is set to $current_governor" --radiolist "\nSelect the Scaling Governor to use:\n" 16 $((MSG_MAX_LENGTH + 58)) 6 "${GOVERNORS_MENU[@]}" 3>&1 1>&2 2>&3 | tr -d '"')
 [ -z "$scaling_governor" ] && {
   whiptail --backtitle "Proxmox VE Helper Scripts" --title "No CPU Scaling Governor Selected" --msgbox "It appears that no CPU Scaling Governor was selected" 10 68
   clear
@@ -49,7 +59,7 @@ yes)
   EXISTING_CRONTAB=$(crontab -l 2>/dev/null)
   if [[ -n "$EXISTING_CRONTAB" ]]; then
     TEMP_CRONTAB_FILE=$(mktemp)
-    echo "$EXISTING_CRONTAB" | grep -v "@reboot (sleep 60 && echo*" >"$TEMP_CRONTAB_FILE"
+    echo "$EXISTING_CRONTAB" | grep -vF "@reboot (sleep 60 && echo" >"$TEMP_CRONTAB_FILE"
     crontab "$TEMP_CRONTAB_FILE"
     rm "$TEMP_CRONTAB_FILE"
   fi