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Actually the short answer is what sideburns said in the comments of the question; however I think that you might need a more complete answer.

Find out where your USB drive is mounted. e.g. In Files (nautilus) go to the USB disk and press Ctrl+L. You'll see the address of USB mount point in the address bar (e.g. /run/media/username/FlashLabel/)

Open a Terminal, and run the following command (replace the correct address:

sudo chown 1000:1000 /run/media/username/FlashLabel/* -R

or

su -c 'chown 1000:1000 /run/media/username/FlashLabel/* -R'

I used a '*' so that it'll change the owner of all files/directories in your USB disk. You can put the file name of the desired files instead of it.