That's not a technical problem, but a political one. Imagine if I said "yeah, solar sucks because people burn down the solar farms" and then you saw me sneaking away with a can of gas...

Deep geological storage, but not in salt beds, is a simple answer. And not entombed, etc. Just sitting on skids. Waiting to be inspected and repaired. I've been in deep hard-rock mines that individually would hold the entire world's waste.

The true answer though is breeder reactors and using 99% of the fuel, not 3%, and the waste being shorter-term byproducts as well.