Linux Mint: Upload failed; programmer is not responding

Hello there,

I have a problem to upload my compiled sketches onto the board.
I'm using Linux Mint Cinnamon 17 64-bit and the arduino IDE 1:1.0.5 from the official repository as recommended.
Futher the board is a "DFRduino UNO v3.0" by DFROBOT. On the chip it says "ATMEL ATMEGA 328"

I suppose there is a problem with the configuration of the avrdude or I'm using the wrong programmer?
I'v already deleted the braille-tty and added my user to the groups "dialout" and "tty".
I'm running out of ideas... :frowning:

Thank you in advance.