Flashing with JetPack 3.2.1 fails - "Read-only file system"

What location is JetPack being run from on the host? I’m guessing you are running JetPack from perhaps some temporary media location. I’m trying to narrow down where on the host PC the “mnt/” directory is which it is referring to since it is a relative path. If this is some sort of alternate or temporary file system (e.g., an SD card or USB disk), can you describe the storage device?