I am trying to use the Google Coral Dev Board. I am following the tutorial Get Started with the Dev Board and I am stucked at the Flash the board part and precisely at the step :
dmesg | grep ttyUSB
This request returns me nothing, in fact there are no usb using the cp210x listed converter after doing dmesg. I have verified the content of /etc/udev/rules.d/65-edgetpu-board.rules and it is good.
And lsusb gives me :
Bus 001 Device 004: ID 045e:0745 Microsoft Corp. Nano Transceiver v1.0 for Bluetooth
Bus 001 Device 005: ID 0424:7800 Standard Microsystems Corp.
Bus 001 Device 003: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
Bus 001 Device 002: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
My user account is in the dialout and plugdev groups. And the cp210x driver is running.
I have this problem on a fresh install of Ubuntu 18.04 LTS and on a Raspberry Pi 3B+.
I have been in touch with Google-Coral re this. I have had the same problem. Linux must have a driver for the particular USB used. The driver is cp210x. Just sorted this out yesterday.
Doing a lsmod should show is cp210x is on your machine.
Link shows how to do the install.
http://headstation.com/archives/instructions-installing-cp210x-serial-bridge-driver/
The driver is available from Silicon Labs and the instructions have the details.
I am still working on this. It is evidently a known issue. It is worth a shot. I am also suspicious of a board problem on mine as Windows cp210x drivers will not id the board. Widows drivers are a very rapid install, That is not a definitive test and will do a Linux make tonight.
Google-Coral has been very helpful on this. I believe they are in Bangalore so there is a 12 hour delay in response. I told them about your posting.