Public bug reported:

Binary package hint: udev

FTDI chipset based USB to Serial converter does not create /dev/ttyUSB*
device on Hardy 64-bit, kernel 2.6.24-19, udev 117-8.

/var/log/kern.log when plugging in the converter:

Jul 25 22:37:14 mars kernel: [ 1537.134393] usb 4-3: new full speed USB device 
using ohci_hcd and address 7
Jul 25 22:37:14 mars kernel: [ 1537.234553] usb 4-3: configuration #1 chosen 
from 1 choice

The output of lsusb command shows:
Bus 004 Device 008: ID 0403:e40b Future Technology Devices International, Ltd

There is no conflict with /etc/udev/rules.d/85-brltty.rules and 'sudo
modprobe ftdi_sio' does not help. On the other hand, my Prolific chipset
based USB to Serial cable works just fine. Attached is the output of
'lsusb -v' command for both devices.

** Affects: udev (Ubuntu)
     Importance: Undecided
         Status: New

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[Hardy] FTDI based USB to Serial Converter not recognized
https://bugs.launchpad.net/bugs/251952
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