Subject: bug#21068: guix system: error: build failed: path `/gnu/store/..-grub.cfg' is not valid

From: Germano Gabbianelli <[email-masked]>
Date: Sun, 26 Jul 2015 21:51:57 +0200

I also tried burning guixsd to an external usb stick and installing 
directly from that, but it failed with the same error.