Hey Andr3w
I suggest doing this ...
Use gparted to format the drive:
1) select your SD from the drop-down menu on the right
2) make sure its unmounted by right click partition -> unmount
3) right click again -> format to -> (id go with fat32)
4) hit the tick / accept on the top of the panel.
Now try again.
You could also use 'Disks' or something similar instead as well to burn the image.
With Disks you can use the restore function to burn the image (see picture in attachment)
If this doesn't work and you still have problems seek me out in the IRC
Cheers
I suggest doing this ...
Use gparted to format the drive:
1) select your SD from the drop-down menu on the right
2) make sure its unmounted by right click partition -> unmount
3) right click again -> format to -> (id go with fat32)
4) hit the tick / accept on the top of the panel.
Now try again.
You could also use 'Disks' or something similar instead as well to burn the image.
With Disks you can use the restore function to burn the image (see picture in attachment)
If this doesn't work and you still have problems seek me out in the IRC

Cheers