Ni! The particular commit for time-machine was taken from this tutorial:
https://gitlab.inria.fr/guix-hpc/open-science-days-tutorial/ Cheers, ale .~´ $ guix time-machine --commit=b94724e8b2102be0fe9d19e9dfe44d6f7101bd4b -- shell -CN --no-cwd python Updating channel 'nonguix' from Git repository at 'https://gitlab.com/nonguix/nonguix'... Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'... substitute: updating substitutes from 'https://substitutes.nonguix.org'... 100.0% substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 100.0% substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0% substitute: updating substitutes from 'https://substitutes.nonguix.org'... 100.0% substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 100.0% substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0% substitute: updating substitutes from 'https://substitutes.nonguix.org'... 100.0% substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 100.0% substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0% building /gnu/store/7addpiwsim2577x89c93z66fw4hlvg1r-module-import.drv... building /gnu/store/bn285pdih12fwp3qh26rrs6wfyz9zxd1-module-import.drv... building /gnu/store/4md59x5c6h50j026l6dh1wp63bcaj60w-module-import-compiled.drv... building /gnu/store/jx6rmz8vdks5gkc8zqrzcmww1iv7i8zs-module-import-compiled.drv... building /gnu/store/vh6xam2bsqsm055sh7lhc8x7dh4wnw68-compute-guix-derivation.drv... Computing Guix derivation for 'x86_64-linux'... /Backtrace: 14 (primitive-load "/gnu/store/pa74lqbhmq8xmvnjg98p1z6jq5xvr23w-compute-guix-derivation") In ice-9/eval.scm: 155:9 13 (_ _) 159:9 12 (_ #(#(#(#(#(#(#(#(#(#(#(#(#(#(#(#(#<directory (guile-u?> ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?)) In ice-9/boot-9.scm: 152:2 11 (with-fluid* _ _ _) 152:2 10 (with-fluid* _ _ _) In ./guix/store.scm: 2170:24 9 (run-with-store #<store-connection 256.100 7f87bfb240a0> #<procedure 7f87b1ebf370 at ./guix/self.scm:1?> ?) 1998:8 8 (_ #<store-connection 256.100 7f87bfb240a0>) In ./guix/gexp.scm: 299:22 7 (_ #<store-connection 256.100 7f87bfb240a0>) 1180:2 6 (_ #<store-connection 256.100 7f87ab19e640>) 1046:2 5 (_ #<store-connection 256.100 7f87ab19e640>) 892:4 4 (_ #<store-connection 256.100 7f87ab19e640>) In ./guix/store.scm: 2055:12 3 (_ #<store-connection 256.100 7f87ab19e640>) 1403:5 2 (map/accumulate-builds #<store-connection 256.100 7f87ab19e640> #<procedure 7f87a6e30f60 at ./guix/sto?> ?) 1419:15 1 (_ #<store-connection 256.100 7f87ab19e640> ("/gnu/store/mh01bp841xvcvv8mv6car7l92h6h19rk-curl-7.84?" ?) ?) 1419:15 0 (loop #f) ./guix/store.scm:1419:15: In procedure loop: ERROR: 1. &store-protocol-error: message: "`/gnu/store/bq54ayj2n661xqaiwj93f8nq4jvhcjs7-guix-1.4.0-19.7ca9809/bin/guix substitute' died unexpectedly" status: 1 guix time-machine: error: You found a bug: the program '/gnu/store/pa74lqbhmq8xmvnjg98p1z6jq5xvr23w-compute-guix-derivation' failed to compute the derivation for Guix (version: "b94724e8b2102be0fe9d19e9dfe44d6f7101bd4b"; system: "x86_64-linux"; host version: "aeba4849b42b4d3ac75341ac4b61843c1fe48181"; pull-version: 1). Please report the COMPLETE output above by email to <bug-guix@gnu.org>.