Arduino Mega not being seen in ubuntu

Development Tools Uploading
1

I have a Arduino mega 2560 and i want to upload a simple code to it to just write a serial line but it wont upload in the tools section i have the mega 2560 selected but then in ports it only shows the /dev/ttyS4 which i read is an internal serial port in my laptop so i belive that that port not being a proper usb port like i have the mega plugged into in is causing this "avrdude: stk500v2_ReceiveMessage(): timeout" i have already done the dialout group but lsusb and dmesg show no diffrence when its plugged in or not and have installed it as a deb from the app store through flatpak through apt install and am currently using the app image

Specs:
Lenovo T440p
Ubuntu 25.04
Arduino IDE 2.3.6(Cli 1.2.0)
SunFounder Arduino Mega 2560

2

Unplug the Mega from the computer.
Start a terminal and type in:

dmesg -w |grep -i usb [ENTER]

Plug the Mega in, see if dmesg changes.
Type in [CNTRL + c] to exit dmesg.

Here's mine in Mint 21 and Arduino Nano.

Screenshot from 2025-08-03 20-48-20
Screenshot from 2025-08-03 20-48-20675×482 58.1 KB

3

nope nothing changes and im using two known good ports and a known good cable

4

Do other Arduinos work?

5

i dont know i only have this arduino mega but i just tried it over on my windows desktop same issue with that timeout the lights power up and everything like it should though?

6

Which USB to serial adapter is on your Mega clone? If a CH340, might be a driver problem.

7

What is the result of lsusb ?

8

no it is the mega 16u2

9

Look in your /dev directory for entries like ttyACM0 or ttyUSB0.

10

no just tty and ttyS but their is a bus folder with a usb folder inside showing 4 files which is how many usb ports i have and theirs another just usb file in the dev folder but it just has one file

11

Oh well, afraid I'm done. Check back once in a while, one of the Linux experts will log in.
Good luck.

12

Does the Windows device manager show anything useful?

13

Ok well thanks for the help