Were you trying to use Nix for running your graphical terminal on a non-NixOS system? I have personally worked with Nix on a Fedora system, but only for things

Were you trying to use Nix for running your graphical terminal on a non-NixOS system? I have personally worked with Nix on a Fedora system, but only for things that run inside the terminal. EDIT: I removed some content here because it didn't think it applied since you clarified in another comment you were trying to use existing packages.