USB MBR Damaged

Solution 1:

You can try getting it fixed with TestDisk. It worked for me. Here is what I did to get it done.

First, you need to download TestDisk, and run it. Connect the USB Drive and select Analyse disk. Select Rebuild MBR, and Write Boot

Another thing you can try to fix the MBR:

Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:

sudo apt-get install mbr
fdisk -l to find out which device is your flash drive
install-mbr /dev/sdx (replacing x with your flash device)

^{Source:Pen Drive Linux}