# Malduino 'can't open device "/dev/ttyACM0": Device or resource busy'  on Ubuntu

## Set Permissions

Add your user to the 'dialout' group

```bash
sudo usermod -aG dialout yourusername
```

(optional) Verify:

```bash
groups
```

'dialout' should be in the included in the list of groups.

## Create udev Rule

```bash
sudo vi /etc/udev/rules.d/77-arduino.rules
```

File content:

```text
ATTRS{idVendor}=="1b4f", ENV{ID_MM_DEVICE_IGNORE}="1"
```