Bug#970211: gdm3: XDMCP Authentication is required to create a color profile

[Ryutaroh Matsumoto]

Package: gdm3
Version: 3.37.90-2
Severity: minor

Dear Maintainer,

When gdm3 responds to an XDMCP query, it always displays
(at least the default installation with Debian installer weekly build of Sept. 2020)
"Authentication Required
Authentication is required to create a color profile"

One can click "cancel" and both gdm3 and gnome session work fine.
This is a minor cosmetic problem, but the default installation can be
hopefully more friendly...

I do not see a similar message with LightDM XDMCP login...

Best regards, Ryutaroh Matsumoto

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 5.8.0-1-amd64 (SMP w/12 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gdm3 depends on:
ii  accountsservice                       0.6.55-3
ii  adduser                               3.118
ii  dbus                                  1.12.20-1
ii  dconf-cli                             0.36.0-1
ii  dconf-gsettings-backend               0.36.0-1
ii  debconf [debconf-2.0]                 1.5.74
ii  gir1.2-gdm-1.0                        3.37.90-2
ii  gnome-session [x-session-manager]     3.37.0-2
ii  gnome-session-bin                     3.37.0-2
ii  gnome-session-common                  3.37.0-2
ii  gnome-settings-daemon                 3.37.92-1
ii  gnome-shell                           3.37.92-3
ii  gnome-terminal [x-terminal-emulator]  3.36.2-3
ii  gsettings-desktop-schemas             3.37.2-1
ii  libaccountsservice0                   0.6.55-3
ii  libaudit1                             1:2.8.5-3+b1
ii  libc6                                 2.31-3
ii  libcanberra-gtk3-0                    0.30-7
ii  libcanberra0                          0.30-7
ii  libgdk-pixbuf2.0-0                    2.40.0+dfsg-5
ii  libgdm1                               3.37.90-2
ii  libglib2.0-0                          2.64.4-1
ii  libglib2.0-bin                        2.64.4-1
ii  libgtk-3-0                            3.24.22-1
ii  libkeyutils1                          1.6.1-2
ii  libpam-modules                        1.3.1-5
ii  libpam-runtime                        1.3.1-5
ii  libpam-systemd                        246.4-1
ii  libpam0g                              1.3.1-5
ii  librsvg2-common                       2.48.8+dfsg-1
ii  libselinux1                           3.1-2
ii  libsystemd0                           246.4-1
ii  libx11-6                              2:1.6.10-3
ii  libxau6                               1:1.0.8-1+b2
ii  libxcb1                               1.14-2
ii  libxdmcp6                             1:1.1.2-3
ii  lsb-base                              11.1.0
ii  mutter [x-window-manager]             3.36.5-1
ii  policykit-1                           0.105-29
ii  procps                                2:3.3.16-5
ii  ucf                                   3.0043
ii  x11-common                            1:7.7+20
ii  x11-xserver-utils                     7.7+8

Versions of packages gdm3 recommends:
ii  at-spi2-core    2.36.1-1
ii  desktop-base    10.0.3
ii  x11-xkb-utils   7.7+5
ii  xserver-xephyr  2:1.20.8-2
ii  xserver-xorg    1:7.7+20
ii  zenity          3.32.0-5

Versions of packages gdm3 suggests:
pn  gnome-orca            <none>
pn  libpam-fprintd        <none>
ii  libpam-gnome-keyring  3.36.0-1

-- Configuration Files:
/etc/gdm3/daemon.conf changed:
[daemon]
[security]
[xdmcp]
Enable=true
ShowLocalGreeter=false
[chooser]
[debug]


-- debconf information:
* shared/default-x-display-manager: gdm3
  gdm3/daemon_name: /usr/sbin/gdm3