Out of sync, really stuck!

I’ve had some issues syncing to a new desktop.

Desktop: 1.27.4, Windows 11

Laptop: 1.18.0-ds1, Ubuntu Jammy (this seems to be the latest available? syncthing package : Ubuntu)

On desktop: “syncing: name is invalid, must not end in space or period on Windows”

This was originally on a previous Windows device, but fine - I’ve deleted those files on my laptop, rescanned, but desktop still showing that error. I guess it’s still trying to sync them?

And now, not sure how, on my laptop: “no connected device has the required version of this file”.

Is this the time to reset the index?