I have the latest edition of ubuntu, formated my pc 1 week ago. I Right clicked on the USB flash partition and I sow the format option. It is not grayed out, I do the format, it shows no files when I open the usb file, but when I click on priorities, it shows 94% full.
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You will need to unmount the disk before formatting it. You can do this by clicking on the eject icon next to drive in Nautilus:
You can then right-click on the drive to format it. If you still face problems, try using a more advanced partitioning tool like GParted that will tell you why things aren't working as you expect.

Aurelia
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I will try your second option and see from there, because first one doesn't work for my haunted pc...! – user217576 Nov 20 '13 at 12:18