Hello, I *think* this may be caused by the fact that dbus-test-runner was probably built in an ad-hoc manner (running guix build on the berlin machine directly), but I am unsure. At any rate, the log file it returns is not helpful:
--8<---------------cut here---------------start------------->8--- $ wget -q -O- $(./pre-inst-env guix build dbus-test-runner --log-file) | zcat substitute: updating substitutes from 'http://141.80.167.131'... 100.0% fetching path `/gnu/store/3x0nqzc6n955sdzywirwbvssy5qy3g66-dbus-test-runner-19.04.0'... @ substituter-started /gnu/store/3x0nqzc6n955sdzywirwbvssy5qy3g66-dbus-test-runner-19.04.0 substitute Downloading http://141.80.167.131/nar/lzip/3x0nqzc6n955sdzywirwbvssy5qy3g66-dbus-test-runner-19.04.0... dbus-test-runner-19.04.0 136KiB/s 00:01 | 76KiB transferred @ substituter-succeeded /gnu/store/3x0nqzc6n955sdzywirwbvssy5qy3g66-dbus-test-runner-19.04.0 --8<---------------cut here---------------end--------------->8--- That's for dbus-test-runner on the core-updates-frozen-batched-changes branch. Thanks, Maxim