When I go to the appearance admin page, it shows a whole bunch of themes that I don't need (for example the stock "Twenty Fifteen" theme), but when I go to delete them, it fails, saying:
Deletion failed: The requested theme does not exist.
If I look in my wp-content/themes folder, I can see that the theme is indeed not there.
Why are these themes listed, and how can I remove them?
I've seen many questions asking about the opposite problem, but not this way around!
