Bug#911619: gdm3 package overrides custom settings in /etc without asking

[js jb]

Package: gdm3
Version: 3.30.1-1
Severity: normal

Dear Maintainer,

===========================================================================
After upgrading gnome-core, which depends on gdm3, I found that the custom
display manager I had entered in: /etc/X11/default-display-manager
had been overwritten with gdm3.

Normally packages only overwrite configuration entries that have **not** been
modified by the user but **ask** if a modified entry should be overwritten.

This is important because one might not want to run gdm3 at all but still need gnome-core
to be up to date for the other packages it provides.

===========================================================================


-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 4.17.0-3-686-pae (SMP w/6 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=ANSI_X3.4-1968) (ignored: LC_ALL set to C), LANGUAGE=en_US.UTF-8 (charmap=ANSI_X3.4-1968) (ignored: LC_ALL set to C)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages gdm3 depends on:
ii  accountsservice                              0.6.45-1
ii  adduser                                      3.117
ii  afterstep [x-window-manager]                 2.2.12-11.1
ii  awesome [x-window-manager]                   4.2-5
ii  blackbox [x-window-manager]                  0.70.1-36
ii  dconf-cli                                    0.28.0-2
ii  dconf-gsettings-backend                      0.28.0-2
ii  debconf [debconf-2.0]                        1.5.69
ii  fluxbox [x-window-manager]                   1.3.5-2+b2
ii  gir1.2-gdm-1.0                               3.30.1-1
ii  gnome-session [x-session-manager]            3.30.0-2
ii  gnome-session-bin                            3.30.0-2
ii  gnome-session-flashback [x-session-manager]  3.30.0-1
ii  gnome-settings-daemon                        3.30.0-1
ii  gnome-shell                                  3.30.1-2
ii  gnome-terminal [x-terminal-emulator]         3.30.1-1
ii  gsettings-desktop-schemas                    3.28.0-1
ii  lesstif-bin [x-window-manager]               1:0.95.2-1.1
ii  libaccountsservice0                          0.6.45-1
ii  libaudit1                                    1:2.8.3-1
ii  libc6                                        2.27-6
ii  libcanberra-gtk3-0                           0.30-6
ii  libcanberra0                                 0.30-6
ii  libgdk-pixbuf2.0-0                           2.38.0+dfsg-6
ii  libgdm1                                      3.30.1-1
ii  libglib2.0-0                                 2.58.1-2
ii  libglib2.0-bin                               2.58.1-2
ii  libgtk-3-0                                   3.24.1-2
ii  libkeyutils1                                 1.5.9-9.2
ii  libpam-modules                               1.1.8-3.7
ii  libpam-runtime                               1.1.8-3.7
ii  libpam-systemd                               233-10
ii  libpam0g                                     1.1.8-3.8
ii  librsvg2-common                              2.40.20-3
ii  libselinux1                                  2.8-1+b1
ii  libsystemd0                                  233-10
ii  libwrap0                                     7.6.q-27
ii  libx11-6                                     2:1.6.7-1
ii  libxau6                                      1:1.0.8-1+b2
ii  libxcb1                                      1.13.1-1
ii  libxdmcp6                                    1:1.1.2-3
ii  lsb-base                                     9.20170808
ii  metacity [x-window-manager]                  1:3.28.0-1
ii  mutter [x-window-manager]                    3.30.0-1
ii  openbox [x-window-manager]                   3.6.1-7
ii  oroborus [x-window-manager]                  2.0.20
ii  pekwm [x-window-manager]                     0.1.17-3
ii  policykit-1                                  0.105-20
ii  procps                                       2:3.3.14-1+b1
ii  sawfish [x-window-manager]                   1:1.11.90-1.1
ii  twm [x-window-manager]                       1:1.0.9-1+b1
ii  ucf                                          3.0038
ii  wmaker [x-window-manager]                    0.95.8-2
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]         0.8.7.4-1
ii  xfwm4 [x-window-manager]                     4.12.5-1
ii  xterm [x-terminal-emulator]                  333-1

Versions of packages gdm3 recommends:
ii  at-spi2-core    2.28.0-3
ii  desktop-base    9.0.5
ii  x11-xkb-utils   7.7+4
pn  xserver-xephyr  <none>
ii  xserver-xorg    1:7.7+19
ii  zenity          3.28.1-1

Versions of packages gdm3 suggests:
ii  gnome-orca            3.30.0-1
pn  libpam-fprintd        <none>
ii  libpam-gnome-keyring  3.28.2-1

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

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