Ubuntu on dual boot messed up my partitions

I have windows 10 on C: drive and I installed ubuntu 14.04 on D: on the 30.51 GB partition and Ubuntu 16.04 on 7.92GB partition.

But both my ubuntu are always crashing and I want to delete and install again. The problem is that now I cant delete both partitions because they only show the "help" option.

How the hell do I delete this? I have no idea. They say they are primary partitions.