As described in their manual, Linux (and arduino 1.5) is not supported, because sometimes the kernel does not create the device node when trinket is inserted in the usbport.
I suspect the problem lies in the fact that trinket uses only attiny85, and implements the usb stack in software. so probably a subtle bug in linux or in the trinket prevents a proper handshake.
The first time i tried using this board, i was using Ubuntu 13.10, and i believe i had the same problem. Having Upgraded to Ubuntu 14.04, i hoped the situation somewhat improved, as it did.
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