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[Reply #15 on:]

with the help of forum's users I've updated the firmware in a few minutes without any pain
look at comment #4 @ http://arduino.cc/forum/index.php/topic,52447.0.html

[Reply #16 on:]

Oh no,, it's all gone horribly wrong. I followed these instructions

http://arduino.cc/forum/index.php/topic,52447.0.html

very carefully up to the point

UPLOAD THE NEW FIRMWARE (console commands)

The first upload instruction responded with

dfu-programmer: no device present.

which doesn't look good. Am I being stupid? The UNO was plugged in with the little TX light glowing.

I then tried to verify a simple sketch from the IDE. I got  an eror: Cannot run program "avr-gcc" .... NO such file or directory. From this I deduced that my IDE had gone west, so I decided to reinstall it, starting with arduino-core. I went to Synaptic and searched for arduino packages - zilch. I have Lenny installed but there are no arduino packages available, apparently (I checked on the Debian website).

So now what, step by step, do I need to do to restore the situation? The Linux installation instructions on the Arduino website are confusing me.

TIA

[Reply #17 on:]

dfu-programmer: no device present.

I get same error if the atmega8u2 chip is not in DFU mode

my Uno not in DFU mode:
sudo dfu-programmer at90usb82 erase
[sudo] password for mark:
dfu-programmer: no device present.

Uno in DFU mode. There no output if the command works
sudo dfu-programmer at90usb82 erase

[Reply #18 on:]

if you have the TX led "always on" when you plug the board to your linux box you should first upload an "empty sketch" into the board. I've used something like:

Code:

void setup(){}
void loop(){}

but since you cannot upload sketches from your linux box (because of this bug!)  you have to do that from a windows os (mac not tested).