ARDUINO not detected or as ttyUSB0

Hello Guys,

Im using Lattepanda V1 with its Leonardo - Arduino. It so happened that while i was uploading new code (arduino IDE), there was an error and now arduino is not detected by the system anymore. 

"lsusb" command is not showing leonardo device present. As OS im using linux Debian (no gui).

On another board, i have simillar problem: lsusb is not showing Leonardo, but i can see it in devices as /dev/ttyUSB0. Default it should be /ttyACM0 or 1 or 2.

I tried also with avrdude to burn new bootloader - didnt work

I tried holding reset button and just release before the upload procedure begin - didnt work

What else can i do?