using dd on linux works !
In my case the device (SD card 16GB) is on sdf
Do not mount this device, if it is mounted umount it
I my case I had to prepare the partition on SD card, I used gparted to delete the partiton on /dev/sdf and create a new fullsize fat32 partition. Formati it and make it bootable.
When tis done, do the following command in your terminal:
sudo dd if=Ubuntu_14_image.img of=/dev/sdf
the image is ~1.9GB, so it takes a few minutes to copy the image, means youll have to wait a few minutes.
When this is done you can mount dev/sdf1 in any folder you want (/media/) and check if there are files on this partition
Then umount it.
Then remove the SDCARD from your computer.
Enter the SDcard to PCDUINO3 card slot.
Power ON the PCDUINO3.
TX LED must be blinking (this process is in minutes, so you ll have to wait few minutes to finish)
When TX is not blinking anymore unplug the pcduino from power.
Remove the SDcard.
Attach the MONITOR to PCDUINO.
Attach the power cable back to PCDUINO.
In my case it didn work for the first time. I again inserted the SDcard into pcduino to flash it again and waited few minutes so the TX led stopped blinking.
The second time it worked.
It booted to Lubutnu 14.