# ttyUSB0 not present when using CH340

First encountered when using an Arduino Uno with Linux Mint 21.2 Cinnamon. The Arduino Uno used has a CH340 USB to serial converter.

According to some information found on [Ask Ubuntu](https://askubuntu.com/questions/1403705/dev-ttyusb0-not-present-in-ubuntu-22-04) there seems to be a braille device with this chip and Linix seems to give it to brltty.

*Note: this tip was tested on a Dutch version of Linux Mint. Keep this in mind for other derivatives of Debian and some translation errors by me.*

## Steps

* Open a terminal window
* Execute the following command to see if Linux can actually see the device

  ```sh
  lsusb
  ```

* Check the output ans see if a CH340 is present, see example below

  ```sh
  Bus 003 Device 005: ID 1a86:7523 QinHeng Electronics CH340 serial converter
  ```

* If the device indead is present, and you don´t use any braille device, execute the following

  ```sh
  sudo apt-get autoremove --purge -y brltty
  ```

## Source

* [Ask Ubuntu](https://askubuntu.com/questions/1403705/dev-ttyusb0-not-present-in-ubuntu-22-04)