Release 0.21.0 fails to start on Debian arm64: workaround

Just the heads-up in case you bump into this.

create a `udev` rule 

```shell
sudo nano /etc/udev/rules.d/99-serial.rules
```

then paste this configuration

```shell
UBSYSTEM=="tty", MODE="0666"
KERNEL=="ttyUSB*", MODE="0666"
KERNEL=="ttyACM*", MODE="0666"
```

save and logoff

login and try, it should be working now