Changes to fstab completely breaks ubuntu
Replacing PARTUUID=ba69b10a-b371-4ca0-a2af-8cfd309e34a3 /hdd ext4 defaults 0 2
with UUID=f8f825b9-16a3-426c-a946-8aeb6eebcc51 /hdd auto nosuid,nodev,nofail,x-gvfs-show 0 0
has fixed the issue. (new UUID because I recreated the partition while fiddling around)
It probably didn't like the PARTUUID. I'm not so sure myself.