MATE on gdm

[Guy fleury <hoonandon@gmail.com>]

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hi guix,

i'm trying to build this attached system config with both gnome desktop and
mate desktop(i changed nothing except where are gnome to mate). At the end
I get this error:
==================================================
To complete the upgrade, run 'herd restart SERVICE' to stop,
upgrade, and restart each service that was not automatically restarted.
shepherd: Evaluating user expression (let* ((services (map primitive-load
(?))) # ?) ?).
guix system: error: exception caught while executing 'start' on service
'user-homes':
Throw to key `match-error' with args `("match" "no matching pattern"
"#<<user-account> name: \"root\" password: \"\" uid: 0 group: \"root\"
supplementary-groups: () comment: \"System administrator\" home-directory:
#<procedure home-directory (x)> create-home-directory?: #t shell:
\"/gnu/store/qn1ax1fkj16x280m1rv7mcimfmn9l2pf-bash-4.4.23/bin/bash\"
system?: #f>")'.
bootloader successfully installed on '/dev/sda'
===============================================
but i continue with "guix system reconfigure"
gnome boot without problem but for  mate  when i try to enter password in
the gdm interface i redirected to this interface(see attached picture) i
can't then do anything (keyboard doesn't listen).

the reason i attempt to build both gnome and mate is that i have finished
to update mate  desktop to 1.22 and i was thinking that it is a bug due to
my change so i used the version 1.8 wich is the current
and i get the same result .

i think that:
* my config is wrong see above error(but gnome work).
* or the recent use of gdm doesn't yet be tested for mate(someone to test?)

sorry for my bad English!

Please help!

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;; This is an operating system configuration template
(use-modules (gnu)
	     (gnu system nss))
(use-service-modules desktop)
(use-package-modules certs mate)

(operating-system
  (host-name "guixSd")
  (timezone "Europe/Paris")
  (locale "fr_FR.utf8")

  (bootloader (bootloader-configuration
                (bootloader grub-bootloader)
                (target "/dev/sda")))

  (file-systems (cons (file-system
                        (device (file-system-label "my-root"))
                        (mount-point "/")
                        (type "ext4"))
                      %base-file-systems))

  (users (cons (user-account
                (name "guy")
                (comment "brother")
                (group "users")
                (supplementary-groups '("wheel" "netdev"
                                        "audio" "video"))
                (home-directory "/home/guy"))
               %base-user-accounts))

  ;; This is where we specify system-wide packages.
  (packages (cons* nss-certs         ;for HTTPS access
                   ;gvfs              ;for user mounts
                   %base-packages))

  (services (cons*                               
                    (service mate-desktop-service-type)
                   ;(service account-service-type)
                   %desktop-services))

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

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