I have a USB to serial adapter that I need to use with my Xubuntu install. When I plug it in I can use dmesg and lsusb to locate it. It is clear that the device is attached to ttyUSB0. I am used to finding that under the /dev folder (i.e. /dev/ttyUSB0) but when I look in that folder it is not present. In fact, there are no ttyUSB links of any sort. There are lots of "tty" but no "ttyUSB". I've tried searching but with no luck. Where can the "ttyUSB" links be found?
Update: As requested I am adding the output of dmesg | grep USB0
usb 2-7: FTDI USB Serial Device converter now attached to ttyUSB0
I returned to the original PC, where the problem was encountered, and tried dmesg on it. The results were interesting.
[587216.474235] usb 7-1: FTDI USB Serial Device converter now attached to ttyUSB0
[587221.340323] usb 7-1: usbfs: interface 0 claimed by ftdi_sio while 'brltty' sets config #1
[587221.342999] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[587221.343171] ftdi_sio 7-1:1.0: device disconnected
This showed that brltty is disconnecting me. I looked up the output and found some bug reports which address the problem. The linked report includes the workaround (remove brltty)