I have the Arduino board connected to a USB port of my machine. But I cannot find it under /dev/ directory in my Ubuntu. Does anyone know how to deal with this issue? By the way, "lsusb"'s output proves that it has been recognized. Here is the output of this command:

Bus 002 Device 002: ID 8087:8000 Intel Corp. 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 007: ID 413c:2105 Dell Computer Corp. Model L100 Keyboard
Bus 003 Device 013: ID 2341:0043 Arduino SA Uno R3 (CDC ACM)
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Here is the output of ls -l /dev/ttyACM*

ls: cannot access /dev/ttyACM*: No such file or directory

and the dmesg output when disconnect and reconnect the device:

[1653809.002715] usb 3-11: USB disconnect, device number 13
[1653832.188835] usb 3-11: new full-speed USB device number 14 using xhci_hcd
[1653832.211392] usb 3-11: New USB device found, idVendor=2341, idProduct=0043
[1653832.218400] usb 3-11: New USB device strings: Mfr=1, Product=2, SerialNumber=220
[1653832.226003] usb 3-11: Manufacturer: Arduino (www.arduino.cc)
[1653832.231859] usb 3-11: SerialNumber: 85235353137351708191
[1653832.237468] usb 3-11: ep 0x82 - rounding interval to 1024 microframes, ep desc says 2040 microframes
  • Please edit the output of ls -l /dev/ttyACM* into your question. Also, see if dmesg says anything upon connection. Feb 3, 2015 at 22:28
  • Just did it. Please see the question revised. Feb 3, 2015 at 22:58
  • Plase rerum dmseg after a while after plug in. Seems Luke enumeration is failing. Dmesg should tell you eitch tty gas ben assigned to the device.
    – Lesto
    Feb 3, 2015 at 23:10
  • The output of dmesg is the same as what has been shown in question. Feb 4, 2015 at 14:59

1 Answer 1


Note that lsusb does not guarantee the drives are loaded (See https://superuser.com/questions/165733/will-lsusb-and-lspci-list-devices-for-which-the-system-has-no-drivers)

Per the https://stackoverflow.com/a/14586884/1653571 answer, try an 'lsmod' and see whether you have a 'cdc_acm' module loaded.

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