Missing package exception on initial 'nix develop' after clean install on ARM at AWS (Ubuntu)

[neeshjaa]

I got this exception after following the usual QuickStart to install structure learning on an ARM-based instance at AWS:

ubuntu@ip-172-31-41-23:~/GenSQL.structure-learning$ nix develop
error:
    … while calling the 'derivationStrict' builtin
     at <nix/derivation-internal.nix>:9:12:
      8|
      9|  strict = derivationStrict drvAttrs;
       |      ^
      10|

    … while evaluating derivation 'nix-shell'
     whose name attribute is located at /nix/store/4a3qxnlq7r1gjwfjfqrizpf30hh22bz1-source/pkgs/stdenv/generic/make-derivation.nix:303:7

    … while evaluating attribute 'nativeBuildInputs' of derivation 'nix-shell'
     at /nix/store/4a3qxnlq7r1gjwfjfqrizpf30hh22bz1-source/pkgs/stdenv/generic/make-derivation.nix:347:7:
     346|    depsBuildBuild       = lib.elemAt (lib.elemAt dependencies 0) 0;
     347|    nativeBuildInputs      = lib.elemAt (lib.elemAt dependencies 0) 1;
       |    ^
     348|    depsBuildTarget       = lib.elemAt (lib.elemAt dependencies 0) 2;

    … while evaluating definitions from `/nix/store/aqnklsijb47x7z816nci9zqg8rjv0wnb-source/modules/transposition.nix':

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

    error: Attempt to access packages.aarch64-linux of flake /nix/store/cdrydidy5f0p2gd0nxh5339rwjg3llrm-source, but it does not have it.
    It does have attribute packages, so it appears that it does not support system type aarch64-linux.

The system specs are:
AMI: Ubuntu (24.04 LTS (GNU/Linux 6.8.0-1010-aws aarch64)
Instance type: r6g.8xlarge
Architecture: ARM
Storage: gp3 128GB

The QuickStart setup process went smoothly with no errors. Nix installed in daemon mode, Docker installed from the repository. Just let me know if there's something I can try.

[neeshjaa]

I reproduced the above exception with a clean ARM instance, but also confirmed that the QuickStart process works normally on the x86 architecture. So... something about ARM, though it's curious that the installation would work on MacOS. Maybe something about the AWS AMI?