Hello,

Using Guix from the master branch at commit
b2122b07dc24007263b92247cc479713c2101390, with a system reconfigured on
the 2nd of June (Guix commit bb325c5611553a6db21ee7499ac07d5757d24fc3):

--8<---------------cut here---------------start------------->8---
Generation 216  Jun 02 2021 10:14:19    (current)
  file name: /var/guix/profiles/system-216-link
  canonical file name: /gnu/store/apjg70083nc5xj816y0ff3r8ir9gh5py-system
  label: GNU with Linux-Libre 5.11.20
  bootloader: grub
  root device: /dev/mapper/cryptroot
  kernel: /gnu/store/ghijd80qabdyf0p6jcich9ggnpwrbwxw-linux-libre-5.11.20/bzImage
  channels:
    sfl-packages:
      repository URL: https://gitlab.com/Apteryks/sfl-guix-channel
      branch: master
      commit: 37d017573350b64f8a8c992530153f42806b6a6f
    guix:
      repository URL: https://git.savannah.gnu.org/git/guix.git
      branch: master
      commit: bb325c5611553a6db21ee7499ac07d5757d24fc3
  configuration file:
  /gnu/store/qvhl7ya2xn4gr9mn29hg93p1dcbdlyfy-configuration.scm
--8<---------------cut here---------------end--------------->8---
  
with the guix-daemon running being:

--8<---------------cut here---------------start------------->8---
/gnu/store/9zh3bg8d4y08jnkqyrk6xczahiahhcy4-guix-1.3.0-1.771b866/bin/guix-daemon
29920 guixbuild --max-silent-time 0 --timeout 0 --log-compression none
--discover=no --substitute-urls http://127.0.0.1:8080
https://ci.guix.gnu.org --max-jobs=4
--8<---------------cut here---------------end--------------->8---

Attempting to update my profile keeps failing with:

--8<---------------cut here---------------start------------->8---
$ ./pre-inst-env guix package -m ~/stow/guix/manifest.scm -L ~/src/sfl-guix-channel/ --substitute-urls=https://ci.guix.gnu.org --no-offload
;;; note: source file /home/maxim/src/guix-master/gnu/packages/networking.scm
;;;       newer than compiled /home/maxim/src/guix-master/gnu/packages/networking.go
;;; note: source file /home/maxim/src/guix-master/gnu/packages/networking.scm
;;;       newer than compiled /run/current-system/profile/lib/guile/3.0/site-ccache/gnu/packages/networking.go
The following packages will be installed:
   acpi                      1.7
   adb                       7.1.2_r36
   adwaita-icon-theme        3.34.3
   alsa-utils                1.2.4
   [...]
   xrandr                    1.5.1
   xrdb                      1.2.0
   xsetroot                  1.1.2
   yelp                      3.32.2

122.8 MB will be downloaded
 libreoffice-6.4.7.2  117.1MiB                                  344KiB/s 03:04 [#########         ]  52.7%guix substitute: error: TLS error in procedure 'read_from_session_record_port': Error decoding the received TLS packet.
substitution of /gnu/store/44h13hn5zssfppz67vydxcf95qsc8qfw-libreoffice-6.4.7.2 failed
guix package: error: some substitutes for the outputs of derivation `/gnu/store/9f8sffldy39mprihx6xgrs7hys9j75jm-libreoffice-6.4.7.2.drv' failed (usually happens due to networking issues); try `--fallback' to build derivation from source
--8<---------------cut here---------------end--------------->8---

I'm attaching my (large!) profile manifest.  It depends on the
https://gitlab.com/Apteryks/sfl-guix-channel channel, which just adds 3
Python packages.  You could comment out the "sflvault-client" package
from the manifest to lift that requirement.

Thanks,

Maxim