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

[Germano Gabbianelli <tyrion.mx@gmail.com>]

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Hello,
I am using lubuntu 14.04 and I installed the binary version of guix 
following the documentation ( 
https://www.gnu.org/software/guix/manual/html_node/Binary-Installation.html#Binary-Installation 
)

Then I ran `guix pull`, made a new partition (ext4) and tried to run 
`guix system init` on it:

$ sudo guix system init /mnt/etc/config.scm /mnt

The config.scm is attached. The interesting part is that I specified to 
install grub on /dev/sda9 ( the root partition for guix) instead of 
/dev/sda. The command failed saying that "Embedding is not possible" ( 
here details: https://paste.debian.net/282642/ ).

Following the advice got from Mark on the IRC channel I tried specifing 
the --no-grub flag, but got an other error:

tyrion ~$ sudo guix system init --no-grub /mnt/etc/config.scm /mnt
[sudo] password for tyrion:
warning: failed to install locale: Invalid argument
/gnu/store/q32xg8nmyjwrl5yc18hj7ay5h4rgzkgy-system

initializing operating system under '/mnt'...
guix system: error: build failed: path 
`/gnu/store/hill6gywff6p2c3h1zbc7h5xj0cr4yn2-grub.cfg' is not valid

I also trying reinstalling guix by deleting /gnu, /var/guix, and 
/var/log/guix (and also wiping the partition with rm)
and following again the documentation. Tried again the last command and 
got the same error again.

[-- Attachment #2: config.scm --]
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;; This is an operating system configuration template
;; for a "desktop" setup with X11.

(use-modules (gnu) (gnu system nss))
(use-service-modules desktop)
(use-package-modules xfce ratpoison wicd avahi xorg certs)

(operating-system
  (host-name "gnu")
  (timezone "Europe/Rome")
  (locale "en_US.UTF-8")

  ;; Assuming /dev/sdX is the target hard disk, and "root" is
  ;; the label of the target root file system.
  (bootloader (grub-configuration (device "/dev/sda9")))
  (file-systems (cons*
                  (file-system
                    (device "/dev/sda9")
                    (mount-point "/")
                    (type "ext4"))
                  (file-system
                    (device "/dev/sda3")
                    (mount-point "/mnt/win")
                    (type "ntfs"))
                  (file-system
                    (device "/dev/mapper/home")
                    (mount-point "/home")
                    (type "ext4"))
                  %base-file-systems))
  (mapped-devices (list (mapped-device
                          (source "/dev/sda8")
                          (target "home")
                          (type luks-device-mapping))))

  (users (list (user-account
                (name "tyrion")
                (group "users")
                (supplementary-groups '("wheel" "netdev" "audio" "video"))
                (home-directory "/home/tyrion"))))

  ;; Add Xfce and Ratpoison; that allows us to choose
  ;; sessions using either of these at the log-in screen.
  (packages (cons* xfce ratpoison    ;desktop environments
                   xterm wicd avahi  ;useful tools
                   nss-certs         ;for HTTPS access
                   %base-packages))

  ;; Use the "desktop" services, which include the X11
  ;; log-in service, networking with Wicd, and more.
  (services %desktop-services)

  ;; Allow resolution of '.local' host names with mDNS.
  (name-service-switch %mdns-host-lookup-nss))