Add a command to install all dependencies in help

make.iso.preseed.sh

@@ -32,6 +32,10 @@ case $# in
 		printf '%b\n' "If you want to store temporary files and final ISO in a specific directory."
 		printf '%b\n' "Note : This script require ISO size × 2 (eg for DVD. 3.4GB × 2)."
 		printf '%b\n' "Otherwise \$TMPDIR will be used."
+		printf '%b\n' "-------"
+		printf '%b\n' "Dependencies :"
+		printf '%b\n' "The script use 7z, gzip, xorriso and isolinux. You can install them :"
+		printf '%b\n' "sudo apt install p7zip-full gzip xorriso isolinux"
 		exit 1
 	;;
 esac