bug#34788: Trouble starting GNOME -- fails to activate "org.freedesktop.PolicyKit1"

[Jack Hill <jackhill@jackhill.us>]

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Hi Guix,

Today I noticed that I'm having trouble starting a GNOME session. If I'm 
using GDM, GDM also fails to start. If slim, then slim starts, but bringing 
up the GNOME session fails.

In /var/log/gdm/greeter.log I see "(EE) xf86OpenConsole: Cannot open 
virtual console 7 (Permission denied)"

In /var/log/messages I see "gdm: gdm_session_set_environment_variable: 
assertion 'value != NULL' failed"

and "debus-daemon[598]: [system] Activated service 
'org.freedesktop.PloicyKit1' failed: Launch helper exited with unknown 
return code 1"

My first system generation where this is a problem is my first one to have 
linux-libre-5.0. I do not know how to narrow down where the problem was 
introduced further.

Best,
Jack

[-- Attachment #2: My Operating System definition --]
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;; This is an operating system configuration template
;; for a "desktop" setup with GNOME and Xfce where the
;; root partition is encrypted with LUKS.

(use-modules (gnu)
	     (gnu system nss)
	     (gnu services ssh)
	     (gnu services xorg)
	     (guix-at-duke services endpoint-management))
(use-service-modules desktop)
(use-package-modules certs gnome)

(operating-system
  (host-name "lib-its13")
  (timezone "America/New_York")
  (locale "en_US.utf8")

  ;; Use the UEFI variant of GRUB with the EFI System
  ;; Partition mounted on /boot/efi.
  (bootloader (bootloader-configuration
                (bootloader grub-efi-bootloader)
                (target "/boot/efi")))

  (file-systems (cons* (file-system
                        (device (file-system-label "lib-its13_root"))
                        (mount-point "/")
                        (type "ext4"))
		       (file-system
			 (device (file-system-label "EFI"))
			 (mount-point "/boot/efi")
			 (type "vfat"))
                      %base-file-systems))

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

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

  ;; Add GNOME and/or Xfce---we can choose at the log-in
  ;; screen with F1.  Use the "desktop" services, which
  ;; include the X11 log-in service, networking with
  ;; NetworkManager, and more.
  (services (cons* (service openssh-service-type (openssh-configuration))
		   (gnome-desktop-service)
		   (service gdm-service-type)
		   ;; (service planisphere-report-service-type)
                   (filter (lambda (x)
		   	     (not (eq? (service-kind x) slim-service-type))) %desktop-services)))

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