Guix can't find substitutes, even though guix weather claims they exist

[Timo Wilken]

Hi,

I'm trying to run ungoogled-chromium, but Guix doesn't seem to be able
to download substitutes for it, even though "guix weather" claims that
they should be available.

See below for my shell session.

What's going wrong here? Is there anything I can do to get
substitutes?

Thanks,
Timo

---

$ guix shell ungoogled-chromium -- ungoogled-chromium
The following derivations will be built:
  
/gnu/store/6kgc8cd8wn010ba3jnywj2qsjsjk511s-ungoogled-chromium-109.0.5414.119-1.drv
  /gnu/store/xfiqj5qnnld9g8hdh879aa7gp7wprhaf-chromium-109.0.5414.119.tar.xz.drv
  /gnu/store/4ic70ax830gng6fbaqk3mf3rf2x6vf1j-jsoncpp.patch.drv
  /gnu/store/9sbl6km93sgb7wc2b14sc1fgf7alsb79-openjpeg.patch.drv
  /gnu/store/jcx82l35b070dz91aiz6gffgkngcf1gl-zlib.patch.drv

1,947.8 MB will be downloaded
 fxdiv-0.0-1.63058ef  3KiB                228KiB/s 00:00 100.0%
 chromium-109.0.5414.119.tar.xz  1.63GiB  2.1MiB/s 00:01   0.1%
^C

$ guix weather ungoogled-chromium
computing 1 package derivations for x86_64-linux...
looking for 1 store items on https://ci.guix.gnu.org...
https://ci.guix.gnu.org ☀
  100.0% substitutes available (1 out of 1)
  at least 169.3 MiB of nars (compressed)
  324.4 MiB on disk (uncompressed)
  0.249 seconds per request (0.2 seconds in total)
  4.0 requests per second

  at least 1,000 queued builds
      aarch64-linux: 999 (99.9%)
      i686-linux: 1 (.1%)
  build rate: 41.37 builds per hour
      i686-linux: 27.34 builds per hour
      x86_64-linux: 9.08 builds per hour
      powerpc64le-linux: 3.14 builds per hour
      aarch64-linux: 2.15 builds per hour
looking for 1 store items on https://bordeaux.guix.gnu.org...
https://bordeaux.guix.gnu.org ☀
  100.0% substitutes available (1 out of 1)
  at least 169.4 MiB of nars (compressed)
  324.4 MiB on disk (uncompressed)
  0.194 seconds per request (0.2 seconds in total)
  5.1 requests per second
  (continuous integration information unavailable)

$ guix describe
Generation 69   Feb 26 2023 15:09:41    (current)
  [two non-free channels omitted]
  guix 53a739a
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 53a739ae5d05c3278f09e05f0cba13d698031d92

GUIX_PACKAGE_PATH="/home/timo/src/guix-decls"

$ guix show ungoogled-chromium | recsel -p name,version,location
name: ungoogled-chromium
version: 109.0.5414.119-1
location: gnu/packages/chromium.scm:484:2