Cisco’s new line of equipment now use a mini-USB cable for console configuration. There is no longer a need for a USB to serial adapter or a roll-over cable.
Connecting the USB cable on Linux should give you a new ACM device that looks something like this: “/dev/ttyACM0″.
To verify, you can also look through your dmesg or /var/log/messages :
[265430.720082] usb 4-1: new full speed USB device using uhci_hcd and address 4
[265430.914246] cdc_acm 4-1:1.0: This device cannot do calls on its own. It is not a modem.
[265430.914305] cdc_acm 4-1:1.0: ttyACM0: USB ACM device
If you want the latest (read bleeding edge) kernel that the Ubuntu developers are working, then have a look here:
Be sure to download the 3 files matching your architecture and install.
I am currently using 2.6.37-rc3-natty which will be the kernel that Natty Narwhal (11.04) will be based on. It just works, everything is detected and there is a noticeable increase in responsiveness.