so I have a mini, and I am trying to upload code and am getting a perpetual "programmer not in synch" message. the reset button wasn't helping so I dug in a bit harder and found this in my log
May 14 18:36:25 beefcake kernel: [ 988.660278] usb 7-1: new full-speed USB device number 2 using uhci_hcd
May 14 18:36:25 beefcake kernel: [ 989.192286] usb 7-1: device not accepting address 2, error -71
so I am suspicious of a system config problem, not a hardware one. I have not tried to uploadany code since updating ubuntu a few days ago, so I blame that! I am running a 32 bit systim FWIW, please let me konw if I can provide more info to help you help me.