Update README.md

correct Ubuntu serial port name information

README.md

@@ -27,7 +27,7 @@ The Arduino is just a serial port that accepts commands that are processed by th
 
 Note that it is possible that this code will work on a Mac or on Linux using Visual Studio, in some form.  You would have to edit the code related to how Arduino unit
 interfacing and identification work. The current code attempts to open SerialPort objects for devices with names like 'COM1' and so on.  For example, on a Mac, I
-see a serial port Arduino on port '/dev/cu.usbmodem14101'.  On Ubuntu 22.04LTS I saw a device name like '/dev/ttyARM01'.
+see a serial port Arduino on port '/dev/cu.usbmodem14101'.  On Ubuntu 22.04LTS I saw a device name like '/dev/ttyACM01'.
 
 VS IDE and VS Code seem to want to do only C# on a Mac.  VS Code only wants to do C# on Linux.  So converting the code from VB.Net to C# is in order.
 Using ICSharpCode.CodeConverter vsix plugin for vs2019 (or vs2022), I've converted the VB.Net original project/solution to CSharp.  4 minor code changes were required.