diff --git a/deploy.sh b/deploy.sh
index baaef7f..c66a2b1 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -309,9 +309,8 @@ echo "DISK_SIZE=(\${DISK_SIZE[@]})" >> /tmp/nixos-deployment-temp-file
 EOF
 )
 
-  scp nixos@$TARGET_HOST:$TMPFILE . &> /dev/null
-  source nixos-deployment-temp-file
-  rm nixos-deployment-temp-file
+  scp -i "extra-files/home/numbus-admin/.ssh/id_ed25519" nixos@$TARGET_HOST:$TMPFILE . &> /dev/null
+  source nixos-deployment-temp-file && rm nixos-deployment-temp-file
 
 ### --> Disk selection
   TOTAL_NUMBER_OF_DISKS=${#DISK_NAME[@]}
@@ -334,9 +333,10 @@ EOF
 
   SELECTED_BOOT_DISK=$(gum choose --limit 2 --header "$HEADER" "${GUM_PRINTED_ELEMENTS[@]}")
 
+  NUMBER_OF_BOOT_DISKS="0"
   for ((i=0; i<TOTAL_NUMBER_OF_DISKS; i++)); do
     if printf '%s' "$SELECTED_BOOT_DISK" | grep -iqw "${DISK_NAME[$i]}"; then
-      ((NUMBER_OF_BOOT_DISKS++))
+      NUMBER_OF_BOOT_DISKS=$(($NUMBER_OF_BOOT_DISKS + 1))
       export "BOOT_DISK_${NUMBER_OF_BOOT_DISKS}_ID=${DISK_ID[$i]}"
       unset "GUM_PRINTED_ELEMENTS[${i}]"
     fi
@@ -356,9 +356,10 @@ EOF
 
   SELECTED_DATA_DISK=$(gum choose --limit 9 --header "$HEADER" "${GUM_PRINTED_ELEMENTS[@]}")
 
+  NUMBER_OF_DATA_DISKS="0"
   for i in $(seq 0 $(($TOTAL_NUMBER_OF_DISKS - 1))); do
     if printf '%s' "$SELECTED_DATA_DISK" | grep -iq "${DISK_NAME[$i]}"; then
-      ((NUMBER_OF_DATA_DISKS++))
+      NUMBER_OF_DATA_DISKS=$(($NUMBER_OF_DATA_DISKS + 1))
     fi
   done