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When I am trying to program my Arduino and try to flash the code, I get outputs like

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00

This is because the flashing tool does not recognize the USB serial port.

How can I check my devices connected to serial ports, so that I can change the COM port setting of the Arduino flashing tool?

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type in terminal "hwinfo --short" It might tell you to run "sudo apt install hwinfo" Do that its small. Here the last returning line says"/dev/ttyUSB0 Prolific PL2303 Serial Port" telling me my usb serial port is /dev/ttyUSB0. It tells you everything about everything including its name and port that is connected to your system.

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