i see this is an old topic but same old message when using the avrisp II to program the UNO via the IDE
drivers are ok
Binary sketch size: 1,084 bytes (of a 32,256 byte maximum)
avrdude: usbdev_open(): did not find any USB device "usb"
Are you supplying the Uno with power from USB or other?
MKii only monitors power, it does not supply it.
You installed the drivers located in the IDE folder?
If you have the Jungo driver installed, that does not work with the IDE.
Search your IDE folders for "avrisp2.inf", that's the driver you need set up.
thats it i am using the jungo drivers thanx
i had trouble with the stinking jungo drivers and couldnt get the old driver back up, so luckilly i had an old copy on a laptop and hooked up the avrisp and its a piece of cake .
windows insists on using a newer driver .