Bug#928494: gdm3: Cannot update background setting picture-uri in /etc/gdm3/greeter.dconf-defaults

Andrew Clark ajfclark+debbug at gmail.com
Mon May 6 03:37:42 BST 2019

Package: gdm3
Version: 3.30.2-3
Severity: normal

Dear Maintainer,

I have been having issues with updating the background image in gdm3. I
followed the instruction on the Debian wiki here: https://wiki.debian.org/GDM.

The /etc/gdm3/greeter.dconf-defaults file says I should change picture-uri to a
world readable uri. I tried both a file:// uri and a plain filepath. Neither
work with either restarting gdm, rebooting, running dpkg-reconfigure gdm3 and
then rebooting.

Whilst the background doesn't change, other changes to this file are picked up
(e.g. disable-user-list=true).

I asked on the Debian user list and someone directed me to a method updating
the theme itself, which worked. Thread here: https://lists.debian.org/debian-

Upgrading the package has reverted my changes though and I once again have a
plain background.

-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-4-amd64 (SMP w/12 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE=en_AU:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gdm3 depends on:
ii  accountsservice                       0.6.45-2
ii  adduser                               3.118
ii  dconf-cli                             0.30.1-2
ii  dconf-gsettings-backend               0.30.1-2
ii  debconf [debconf-2.0]                 1.5.71
ii  fvwm [x-window-manager]               1:2.6.8-1
ii  gir1.2-gdm-1.0                        3.30.2-3
ii  gnome-session [x-session-manager]     3.30.1-2
ii  gnome-session-bin                     3.30.1-2
ii  gnome-settings-daemon                 3.30.2-3
ii  gnome-shell                           3.30.2-9
ii  gnome-terminal [x-terminal-emulator]  3.30.2-2
ii  gsettings-desktop-schemas             3.28.1-1
ii  libaccountsservice0                   0.6.45-2
ii  libaudit1                             1:2.8.4-3
ii  libc6                                 2.28-8
ii  libcanberra-gtk3-0                    0.30-7
ii  libcanberra0                          0.30-7
ii  libgdk-pixbuf2.0-0                    2.38.1+dfsg-1
ii  libgdm1                               3.30.2-3
ii  libglib2.0-0                          2.58.3-1
ii  libglib2.0-bin                        2.58.3-1
ii  libgtk-3-0                            3.24.5-1
ii  libkeyutils1                          1.6-6
ii  libpam-modules                        1.3.1-5
ii  libpam-runtime                        1.3.1-5
ii  libpam-systemd                        241-3
ii  libpam0g                              1.3.1-5
ii  librsvg2-common                       2.44.10-2.1
ii  libselinux1                           2.8-1+b1
ii  libsystemd0                           241-3
ii  libwrap0                              7.6.q-28
ii  libx11-6                              2:1.6.7-1
ii  libxau6                               1:1.0.8-1+b2
ii  libxcb1                               1.13.1-2
ii  libxdmcp6                             1:1.1.2-3
ii  lsb-base                              10.2019031300
ii  mutter [x-window-manager]             3.30.2-7
ii  policykit-1                           0.105-25
ii  procps                                2:3.3.15-2
ii  ucf                                   3.0038+nmu1
ii  x11-common                            1:7.7+19
ii  x11-xserver-utils                     7.7+8
ii  xfce4-session [x-session-manager]     4.12.1-6
ii  xfce4-terminal [x-terminal-emulator]
ii  xfwm4 [x-window-manager]              4.12.5-1

Versions of packages gdm3 recommends:
ii  at-spi2-core    2.30.0-7
ii  desktop-base    10.0.2
ii  x11-xkb-utils   7.7+4
ii  xserver-xephyr  2:1.20.3-1
ii  xserver-xorg    1:7.7+19
ii  zenity          3.30.0-2

Versions of packages gdm3 suggests:
ii  gnome-orca            3.30.1-1
pn  libpam-fprintd        <none>
ii  libpam-gnome-keyring  3.28.2-5

-- Configuration Files:
/etc/gdm3/daemon.conf changed [not included]

-- debconf information:
  gdm3/daemon_name: /usr/sbin/gdm3
* shared/default-x-display-manager: gdm3
-------------- next part --------------
# These are the options for the greeter session that can be set 
# through GSettings. Any GSettings setting that is used by the 
# greeter session can be set here.

# Note that you must configure the path used by dconf to store the 
# configuration, not the GSettings path.

# Theming options
# ===============
#  - Change the GTK+ theme
# gtk-theme='Adwaita'
#  - Use another background
# picture-uri='file:///usr/share/themes/Adwaita/backgrounds/stripes.jpg'
#  - Or no background at all
# picture-options='none'
# primary-color='#000000'

# Login manager options
# =====================

# - Disable user list
# disable-user-list=true
# - Disable restart buttons
# disable-restart-buttons=true
# - Show a login welcome message
# banner-message-enable=true
# banner-message-text='Welcome'

# Automatic suspend
# =================
# - Time inactive in seconds before suspending with AC power
#   1200=20 minutes, 0=never
# sleep-inactive-ac-timeout=1200
# - What to do after sleep-inactive-ac-timeout
#   'blank', 'suspend', 'shutdown', 'hibernate', 'interactive' or 'nothing'
# sleep-inactive-ac-type='suspend'
# - As above but when on battery
# sleep-inactive-battery-timeout=1200
# sleep-inactive-battery-type='suspend'

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