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Well, that happens, sadly! However, it appears to me unexpected that any action requiring substitutes is just impractical. In plain words, Guix is unusable for me. Using Guix 14c0380 pulled on May 19th, for instance guix shell hledger loops forever; or almost. Similarly when using =E2=80=9Cguix time-machine= =E2=80=9D or any else requiring substitutes. I thought these kind of troubles had been fixed; last time similar troubles appeared. Other said, I was expecting to either fallback or raise an error (ideally reporting a meaningful message). Well, before opening issues on that topic, maybe people have already clues about what could be fixed and where. Any ideas? Cheers, simon