I used the Ubuntu "Startup disk creator" and two 8GB USB flash drives with Ubuntu 14.4 and 16.4 on them respectively. I then installed both OS side by side on this laptop. All good.
Now when I plug the USB drives in they come up with an icon with a mauve USB and black Flash card. I'd like to re-use them now as just normal flash drives but Nautilus declares them as read-only.
If I sudo su then I can write to them.
I tried using GParted, Unmount, Delete, New-with-NTFS so they could also be read on windows drives. Nautilus still finds them as read-only and they still have the mauve and black images in the icon.
How can I revert these back to usable drives?