I wanted to try Ubuntu 18.04 so I used "make start-up disk" to create a USB with the .iso on it (I'm using 16.04 - x64). I then used it to install 18.04 on a spare partition and all good.
Today I wanted to re-use the USB drive but it I cannot access it.
- I cannot write it.
- I cannot add files to it as root.
- I cannot reformat it with GParted.
- I cannot reformat it with Windows Disk Manager
- I cannot reformat it with Partition Wizard in Windows.
How can I recover this drive?