Switch back to apt, live with the warning message.

aptgrade.go

@@ -133,8 +133,9 @@ func run_check_command(command []string, debug_output bool) (CheckResult, error)
 	return value, err
 }
 
-// const APT = "/usr/bin/apt"
-const APT = "/usr/bin/apt-get"
+const APT = "/usr/bin/apt"
+
+// const APT = "/usr/bin/apt-get"
 
 func main() {
 	// const APT = APT_CMD