{ imports = [ ]; boot = { initrd.availableKernelModules = [ "ata_piix" "uhci_hcd" "sd_mod" "sr_mod" "virtio_pci" "virtio_blk" ]; loader.grub = { enable = true; version = 2; /* Previously the below was /dev/sda; now it suddenly changed to /dev/vda? */ device = "/dev/vda"; }; }; }