Please attach (do not paste inline) the output of these commands after you insert the USB serial converter:
dmesg > dmesg.txt
sudo lsusb -v > lsusbv.txt
** Changed in: linux-source-2.6.20 (Ubuntu)
Assignee: (unassigned) => Tim Gardner
Status: Unconfirmed => Needs Info
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USB serial converter kernel bug
https://launchpad.net/bugs/98570
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