Subject: Update on the installer bug

From: Gábor Boskovits <[email-masked]>
Date: Mon, 13 Jan 2020 22:44:37 +0100

The problem is introduced by the guix update on
fd885160fcfde710e415252463c1034f22f88e59.

Reverting this commit makes the problem go away, so a bisect on the
guix package version is feasible.

The problem can be triggered in the installer image by doing
'guix build guix' in a root terminal.

The first attempt fails, while subsequent attempts succeed.

rm -rf /var/guix/substitute triggers the error again.

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