[Solved]Arduino Uno usb setup issues

Hello, I am new to arduino. I recently just purchased an Uno (surface mounted version) from sparkfun. I am following the tutorials from this site ( http://arduino.cc/en/Tutorial/DigitalReadSerial ) and I have ran into an issue on my second lesson. I am able to upload sketches, but I am not able to use the serial monitor. I am wondering where I went wrong on my setup. I get an error as follows:

http://pastebin.com/Wx6G4yZs edit: or http://pastebin.com/Mw6Sr8PW

when I attempt to use it. I am running Ubuntu 10.04 LTS - the Lucid Lynx 64 bit. I have installed thee rxtx package. dmesg shows:

[  850.430247] usb 4-3: USB disconnect, address 2
[  863.200575] usb 4-3: new full speed USB device using ohci_hcd and address 3
[  863.430257] usb 4-3: configuration #1 chosen from 1 choice
[  863.434059] cdc_acm 4-3:1.0: ttyACM0: USB ACM device

My preferences.txt file is pastebin'd here : http://pastebin.com/sH3UPA1k I have attempted to run as root and it did not fix the issue.

2nd edit:

sudo aptitude remove brltty

fixed it for me after a reboot just long enough for me to upload another sketch, however the moment I tried to view the serial console I am back where I started from. I am curious to know what boards need to have the firmware updated. I have the smd version and I do not know where the serial number is, or which ones are bad.

sudo lsusb -v -d 2341: | grep bcdDevice

gives me:

bcdDevice            0.00

Try the following command with the UNO plugged into the usb port and the serial console open. Please post the output.

lsof 2>&1|grep ttyACM

bcdDevice 0.00

old firmware

what boards need to have the firmware updated

Atmega8U2 firmware: my opinion, if your running linux all the Uno boards.

Ok... I was a bit skeptical having just purchased a brand new board and finding out I need to attempt something that could destroy it (afaik) in order to do anything other than blink an led. Being a Linux user, I know that NOTHING is ever easy to do when it comes to this sort of OS, so I just decided I'd grow a pair and update the firmware -- after all money is only paper right? Well all is well, and my serial issues are no longer existent.

http://arduino.cc/en/Hacking/DFUProgramming8U2 the most informative being this single picture from this post: http://arduino.cc/forum/index.php/topic,53290.msg380874.html#msg380874

made this process absolutely simple. Thank you.

Why are these devices still shipping with an older firmware if a new one appears to fix several issues?