MATE on gdm

[Guy fleury]

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:
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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!

config.scm
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CAM04643.jpg
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