And that for some reason we only see the Linux instance when using and external disk reader. So that the Windows instance is hidden from us.
But that somehow even if its hidden, some files like those Electrum files still show when doing searches on the disk.
So that the Electrum instance and wallet is somehow on the hidden-Windows-part of the disk and I need to figure out how to access that somehow.
Part of this is possible, part of it isn't.
A disk can have multiple partions, and it's possible to install linux on one partion an windows on another one (dual boot).
However, searching a mounted partition and finding hits on another one that's not mounted is not possible.
You can always use fdisk to see if there are more than one partition on your disk, so you can verify if every partition is mounted.
If you don't know how to use fdisk, you can try gparted, that should also work. There are other ways of finding disks and partitions, but gparted is a user-friendly gui that makes thing pretty easy.
But, the thing is, you see source files on the linux partition, you see desktop shortcuts and images on your linux partition... I guess you tried installing a bitcoin client on your linux partition, even if there's an unmounted windows partition on the disk this doesn't change the fact you clearly experimented with bitcoin while running a linux os.