building the system configuration...
error:
       … while calling the 'head' builtin
         at /nix/store/w7nfn4lcfisddz14b0y8n05rjf0dl5lq-source/lib/attrsets.nix:1575:11:
         1574|         || pred here (elemAt values 1) (head values) then
         1575|           head values
             |           ^
         1576|         else

       … while evaluating the attribute 'value'
         at /nix/store/w7nfn4lcfisddz14b0y8n05rjf0dl5lq-source/lib/modules.nix:816:9:
          815|     in warnDeprecation opt //
          816|       { value = addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          817|         inherit (res.defsFinal') highestPrio;

       … while evaluating the option `system.build.toplevel':

       … while evaluating definitions from `/nix/store/w7nfn4lcfisddz14b0y8n05rjf0dl5lq-source/nixos/modules/system/activation/top-level.nix':

       … while evaluating the option `system.systemBuilderArgs':

       … while evaluating definitions from `/nix/store/w7nfn4lcfisddz14b0y8n05rjf0dl5lq-source/nixos/modules/system/activation/activatable-system.nix':

       … while evaluating the option `system.activationScripts.etc.text':

       … while evaluating definitions from `/nix/store/w7nfn4lcfisddz14b0y8n05rjf0dl5lq-source/nixos/modules/system/etc/etc-activation.nix':

       … while evaluating definitions from `/nix/store/w7nfn4lcfisddz14b0y8n05rjf0dl5lq-source/nixos/modules/system/etc/etc.nix':

       … while evaluating the option `environment.etc.dbus-1.source':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: attribute 'stable_upstream' missing
       at /nix/store/63f0m5kng7yg51z22d9rrpd60wcyblb4-source/overlay.nix:76:13:
           75|             (drv: (drv.pname or "") == "nix")
           76|             prev.nixVersions.stable_upstream # default to stable nix if nix is not an input
             |             ^
           77|             inputs;