avrdude: usbdev_open(): did not find any USB device "usb"
Generated from IDE

Because this is a generic error, I'll answer it. I was getting this on STDERR when using the IDE:


  avrdude: usbdev_open(): did not find any USB device "usb"


This is because in the IDE I was using 


Sketch &rarr; Upload Using Programmer [Ctrl + Shift + U]


However, I should have been using


Sketch &rarr; Upload [Ctrl + U]