So after some troubleshooting @nixos_org is finally installing on my home storage server. I had to manually format my drive with GPT partitioning table and keep swap unselected (I'll try to enable a swap file afterwards).
It probably doesn't help that I don't have a wired mouse (and the wireless one we have doesn't register apparently? ¯\_(ツ)_/¯ ).
Now for a little snack and see how far it has progressed then 🫣


