My USB type is FAT32. I tried to solve problem using terminal (http://askubuntu.com/a/96929/130182), but it gives me an error:
mount: special device /dev/sdb1 does not exist
How I can change permissions on FAT32 flash-drive?
Your are on the wrong track.
The message has nothing to do with a permission problem.
The problem is that the usb drive is not recognized below
This may have two different reasons: