check for sudo via 'command -v' instead of dkpg-query

advanced/Scripts/setupLCD.sh

@@ -19,7 +19,7 @@ else
 	echo "::: sudo will be used."
   # Check if it is actually installed
   # If it isn't, exit because the install cannot complete
-  if [[ $(dpkg-query -s sudo) ]];then
+  if [ -x "$(command -v sudo)" ];then
 		export SUDO="sudo"
   else
 		echo "::: Please install sudo or run this script as root."