I got as far as fdisk -l

The tails USB shows up as dev/sdc1
IT says "Warning GPT (GUID Partition table) detected on "dev/sdc'! The util fdisk doesnt support GPT. Use GNU parted.

In gnome, the usb shows the first part as a tails OS and I can mount that, the second part as 'dev/sdc2' and it says "TailsData unknown" which is more than it says in tails. No option to mount or enter password.

I am now lost.