my 4 leonardo (made in italy) print TESTATA to the serial monitor at 9600 baud connected via usb 1 hub
fedora rawhide pc
i compiled the serial read example it uploaded with 1 click and work (tested on 1 leo as my mother will kill me if i ask her to connect all my boards again and again : i'm unable to connect myself the micro-b usb cable)
the bad thing is avrdude didn't find the usb when i tried to put the bootloader in the connected leo