Is it a bad interface in v0.3.5? Yes, for sure. Knots was shoehorned in to an OS that isn't receiving any more updates, and the result is that you can switch between Core and Knots without having to resync the entire chain, but the interface, especially wrt updates, is more confusing.
Is it a bad interface in v0.3.5? Yes, for sure. Knots was shoehorned in to an OS that isn't receiving any more updates, and the result is that you can switch between Core and Knots without having to resync the entire chain, but the interface, especially wrt updates, is more confusing.
The fix, which you can try now, even though it seems like you'd rather just bitch about v0351 in a thread about v040, is to upgrade to v040:
https://docs.start9.com/start-os/0.4.0.x/update-040.html