NIXOS_CONFIG=/mnt/etc/nixos/configuration.nix nix-instantiate /etc/nixos/nixos

trace

warning: you did not specify `--add-root'; the result might be removed by the garbage collector
error: while evaluating the builtin function `derivationStrict':
while instantiating the derivation named `system' at `/etc/nixos/nixos/modules/system/activation/top-level.nix:146:5':
while evaluating the derivation attribute `buildCommand' at `/etc/nixos/nixos/modules/system/activation/top-level.nix:147:5':
while evaluating the builtin function `derivationStrict':
while instantiating the derivation named `etc' at `/etc/nixos/nixos/modules/system/etc/etc.nix:41:5':
while evaluating the derivation attribute `sources' at `/etc/nixos/nixos/modules/system/etc/etc.nix:46:5':
while evaluating the builtin function `derivationStrict':
while instantiating the derivation named `upstart-tty-backgrounds.conf' at `/etc/nixos/nixpkgs/pkgs/build-support/trivial-builders.nix:10:14':
while evaluating the derivation attribute `jobText' at `/etc/nixos/nixos/modules/system/upstart/upstart.nix:113:43':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/strings.nix:54:26':
while evaluating the attribute `preStart' at `/etc/nixos/nixpkgs/pkgs/lib/attrsets.nix:108:41':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/modules.nix:191:43':
while evaluating the attribute `result' at `/etc/nixos/nixpkgs/pkgs/lib/modules.nix:303:11':
while evaluating the builtin function `addErrorContext':

while evaluating the option `jobs.ttyBackgrounds.preStart':
The error may come from the following files:
/etc/nixos/nixos/modules/system/upstart/upstart.nix
<unknown location>

while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/trivial.nix:4:8':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/modules.nix:121:26':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/properties.nix:124:20':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/lists.nix:50:18':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/lists.nix:17:19':
while evaluating the builtin function `addErrorContext':
while evaluating properties:
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/properties.nix:152:33':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/lists.nix:17:19':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/misc.nix:170:17':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/lists.nix:17:19':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/properties.nix:134:25':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/lists.nix:50:18':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/lists.nix:17:19':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/lists.nix:51:14':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/properties.nix:135:13':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/properties.nix:20:14':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/types.nix:13:12':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/types.nix:12:13':
while evaluating the builtin function `isAttrs':
while evaluating the builtin function `head':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/properties.nix:141:27':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/properties.nix:48:27':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/properties.nix:35:16':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/types.nix:13:12':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/types.nix:12:13':
while evaluating the builtin function `isAttrs':
while evaluating the function at `/etc/nixos/nixpkgs/pkgs/lib/attrsets.nix:41:16':
while evaluating the builtin function `getAttr':
value is null while an attribute set was expected
/nix/store/ahnk383yqdv4fknw240jn2pplpwpljcl-nix-1.0pre26015.drv