Before investigating more, could you provide additional details: 1. Version of Guix being used. Did you run ‘guix pull’? 2. Installation method: from source or binary tarball? 3. Command line used to run ‘guix-daemon’? 4. Are substitutes enabled? (See .) 5. Mount options for /tmp (output of ‘mount | grep /tmp’)? Thanks for your report! Ludo’.