The solution in this post does not work for me. I am having the same problem but with different conditions:
I am trying to program a ATTINY25 with my UNO, using http://code.google.com/p/arduino-tiny/
Uploading ArduinoISP sketch was ok. Then programmed the Attiny25 with modified blink sketch...
All was apparently well, but led does not blink, and Arduino IDE shows both messages:
Upload finished. (actually says "Carga terminada." because is in spanish)
and avrdude: usbdev_open(): did not find any USB device "usb"
Can anybody help me please?
Thanks in advance.