Probable fix:

diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 9fad9af99..921914ccd 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -419,7 +419,7 @@ FILE-SYSTEM."
                                  '((gnu build file-systems)))
            (shepherd-service
             (provision (list (file-system->shepherd-service-name file-system)))
-            (requirement `(root-file-system
+            (requirement `(root-file-system udev
                            ,@(map dependency->shepherd-service-name dependencies)))
             (documentation "Check, mount, and unmount the given file system.")
             (start #~(lambda args

To test, invoke

  ./pre-inst-env guix system reconfigure /etc/config.scm