Hey Ludo, Locally on the latest core-updates 70eea6ea14590a5a13656148915bd62f5fecf5f7 running `./pre-inst-env guix build --target=i586-pc-gnu bootstrap-tarballs --fallback' builds successfully.
10:27:47 manolis@aeneas ~/repos/guix [env]$ ./pre-inst-env guix build --target=i586-pc-gnu bootstrap-tarballs --fallback /gnu/store/wxc24a87bqqd3dwhbg8wh8ahmwycn1lj-bootstrap-tarballs-0 Are you sure the problem was on core-updates? Or am I missing something? Manolis