Ubuntu creates /dev/ttyUSB0 for me when I plug in the usb-to-serial-adapter. I have a symbolic-link to /dev/ttyUSB0 from 'dosdevices/com1'. What is new in 10.04 Ubuntu is that I have to sudo chmod o+r and sudo chmod o+w on /dev/ttyUSB0 every time before I start the app which uses that serial line. ttyUSB0 goes away when I unplug the serial adapter from the USB port or shut down the laptop (with Ubuntu 10.04)! And it comes back with permissions rw-rw---- when I plug in the adapter. 'dmesg' reports 'pl2303' and Prolific 2303 USB to serial adapter driver (in several lines of verbiage) when I plug in the adapter. Back in 8.04 Ubuntu the 'other' read/write access and ttyUSB0 stuck around across shutdowns of the laptop and unplugging the adapter (or else ttyUSB0 always came back with 'other' read/write, I cannot recall which it really was).
