LightDM config : theme/wallpaper essentially

.config/lightdm/README

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+Theses files belong to /etc/lightdm.

.config/lightdm/lightdm-gtk-greeter.conf

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+# LightDM GTK+ Configuration
+# Available configuration options listed below.
+#
+# Appearance:
+#  theme-name = GTK+ theme to use
+#  icon-theme-name = Icon theme to use
+#  cursor-theme-name = Cursor theme to use
+#  cursor-theme-size = Cursor size to use
+#  background = Background file to use, either an image path or a color (e.g. #772953)
+#  user-background = false|true ("true" by default)  Display user background (if available)
+#  transition-duration = Length of time (in milliseconds) to transition between background images ("500" by default)
+#  transition-type = ease-in-out|linear|none  ("ease-in-out" by default)
+#
+# Fonts:
+#  font-name = Font to use
+#  xft-antialias = false|true  Whether to antialias Xft fonts
+#  xft-dpi = Resolution for Xft in dots per inch (e.g. 96)
+#  xft-hintstyle = none|slight|medium|hintfull  What degree of hinting to use
+#  xft-rgba = none|rgb|bgr|vrgb|vbgr  Type of subpixel antialiasing
+#
+# Login window:
+#  active-monitor = Monitor to display greeter window (name or number). Use #cursor value to display greeter at monitor with cursor. Can be a semicolon separated list
+#  position = x y ("50% 50%" by default)  Login window position
+#  default-user-image = Image used as default user icon, path or #icon-name
+#  hide-user-image = false|true ("false" by default)
+#
+# Panel:
+#  panel-position = top|bottom ("top" by default)
+#  clock-format = strftime-format string, e.g. %H:%M
+#  indicators = semi-colon ";" separated list of allowed indicator modules. Built-in indicators include "~a11y", "~language", "~session", "~power", "~clock", "~host", "~spacer". Unity indicators can be represented by short name (e.g. "sound", "power"), service file name, or absolute path
+#
+# Accessibility:
+#  a11y-states = states of accessibility features: "name" - save state on exit, "-name" - disabled at start (default value for unlisted), "+name" - enabled at start. Allowed names: contrast, font, keyboard, reader.
+#  keyboard = command to launch on-screen keyboard (e.g. "onboard")
+#  keyboard-position = x y[;width height] ("50%,center -0;50% 25%" by default)  Works only for "onboard"
+#  reader = command to launch screen reader (e.g. "orca")
+#
+# Security:
+#  allow-debugging = false|true ("false" by default)
+#  screensaver-timeout = Timeout (in seconds) until the screen blanks when the greeter is called as lockscreen
+#
+# Template for per-monitor configuration:
+#  [monitor: name]
+#  background = overrides default value
+#  user-background = overrides default value
+#  laptop = false|true ("false" by default) Marks monitor as laptop display
+#  transition-duration = overrides default value
+#
+[greeter]
+active-monitor=0
+background=/usr/share/pixmaps/totoro.jpg
+#user-background=
+theme-name=Arc
+icon-theme-name=Arc
+font-name=Roboto 10
+#xft-antialias=
+#xft-dpi=
+#xft-hintstyle=
+#xft-rgba=
+indicators= ~host;~spacer;~clock;~spacer;
+#clock-format=
+#keyboard=
+#reader=
+#position=
+#screensaver-timeout=

.config/lightdm/lightdm.conf

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+#
+# General configuration
+#
+# start-default-seat = True to always start one seat if none are defined in the configuration
+# greeter-user = User to run greeter as
+# minimum-display-number = Minimum display number to use for X servers
+# minimum-vt = First VT to run displays on
+# lock-memory = True to prevent memory from being paged to disk
+# user-authority-in-system-dir = True if session authority should be in the system location
+# guest-account-script = Script to be run to setup guest account
+# logind-check-graphical = True to on start seats that are marked as graphical by logind
+# log-directory = Directory to log information to
+# run-directory = Directory to put running state in
+# cache-directory = Directory to cache to
+# sessions-directory = Directory to find sessions
+# remote-sessions-directory = Directory to find remote sessions
+# greeters-directory = Directory to find greeters
+# backup-logs = True to move add a .old suffix to old log files when opening new ones
+# dbus-service = True if LightDM provides a D-Bus service to control it
+#
+[LightDM]
+#start-default-seat=true
+#greeter-user=lightdm
+#minimum-display-number=0
+#minimum-vt=7 # Setting this to a value < 7 implies security issues, see FS#46799
+#lock-memory=true
+#user-authority-in-system-dir=false
+#guest-account-script=guest-account
+#logind-check-graphical=false
+log-directory=/var/log/lightdm
+run-directory=/run/lightdm
+#cache-directory=/var/cache/lightdm
+#sessions-directory=/usr/share/lightdm/sessions:/usr/share/xsessions:/usr/share/wayland-sessions
+#remote-sessions-directory=/usr/share/lightdm/remote-sessions
+#greeters-directory=$XDG_DATA_DIRS/lightdm/greeters:$XDG_DATA_DIRS/xgreeters
+#backup-logs=true
+#dbus-service=true
+
+#
+# Seat configuration
+#
+# Seat configuration is matched against the seat name glob in the section, for example:
+# [Seat:*] matches all seats and is applied first.
+# [Seat:seat0] matches the seat named "seat0".
+# [Seat:seat-thin-client*] matches all seats that have names that start with "seat-thin-client".
+#
+# type = Seat type (local, xremote, unity)
+# pam-service = PAM service to use for login
+# pam-autologin-service = PAM service to use for autologin
+# pam-greeter-service = PAM service to use for greeters
+# xserver-backend = X backend to use (mir)
+# xserver-command = X server command to run (can also contain arguments e.g. X -special-option)
+# xmir-command = Xmir server command to run (can also contain arguments e.g. Xmir -special-option)
+# xserver-config = Config file to pass to X server
+# xserver-layout = Layout to pass to X server
+# xserver-allow-tcp = True if TCP/IP connections are allowed to this X server
+# xserver-share = True if the X server is shared for both greeter and session
+# xserver-hostname = Hostname of X server (only for type=xremote)
+# xserver-display-number = Display number of X server (only for type=xremote)
+# xdmcp-manager = XDMCP manager to connect to (implies xserver-allow-tcp=true)
+# xdmcp-port = XDMCP UDP/IP port to communicate on
+# xdmcp-key = Authentication key to use for XDM-AUTHENTICATION-1 (stored in keys.conf)
+# unity-compositor-command = Unity compositor command to run (can also contain arguments e.g. unity-system-compositor -special-option)
+# unity-compositor-timeout = Number of seconds to wait for compositor to start
+# greeter-session = Session to load for greeter
+# greeter-hide-users = True to hide the user list
+# greeter-allow-guest = True if the greeter should show a guest login option
+# greeter-show-manual-login = True if the greeter should offer a manual login option
+# greeter-show-remote-login = True if the greeter should offer a remote login option
+# user-session = Session to load for users
+# allow-user-switching = True if allowed to switch users
+# allow-guest = True if guest login is allowed
+# guest-session = Session to load for guests (overrides user-session)
+# session-wrapper = Wrapper script to run session with
+# greeter-wrapper = Wrapper script to run greeter with
+# guest-wrapper = Wrapper script to run guest sessions with
+# display-setup-script = Script to run when starting a greeter session (runs as root)
+# display-stopped-script = Script to run after stopping the display server (runs as root)
+# greeter-setup-script = Script to run when starting a greeter (runs as root)
+# session-setup-script = Script to run when starting a user session (runs as root)
+# session-cleanup-script = Script to run when quitting a user session (runs as root)
+# autologin-guest = True to log in as guest by default
+# autologin-user = User to log in with by default (overrides autologin-guest)
+# autologin-user-timeout = Number of seconds to wait before loading default user
+# autologin-session = Session to load for automatic login (overrides user-session)
+# autologin-in-background = True if autologin session should not be immediately activated
+# exit-on-failure = True if the daemon should exit if this seat fails
+#
+[Seat:*]
+#type=local
+#pam-service=lightdm
+#pam-autologin-service=lightdm-autologin
+#pam-greeter-service=lightdm-greeter
+#xserver-backend=
+xserver-command=X -ardelay 300 -arinterval 30
+#xmir-command=Xmir
+#xserver-config=
+#xserver-layout=
+#xserver-allow-tcp=false
+#xserver-share=true
+#xserver-hostname=
+#xserver-display-number=
+#xdmcp-manager=
+#xdmcp-port=177
+#xdmcp-key=
+#unity-compositor-command=unity-system-compositor
+#unity-compositor-timeout=60
+#greeter-session=example-gtk-gnome
+#greeter-hide-users=false
+#greeter-allow-guest=true
+#greeter-show-manual-login=false
+#greeter-show-remote-login=true
+#user-session=default
+#allow-user-switching=true
+#allow-guest=true
+#guest-session=
+session-wrapper=/etc/lightdm/Xsession
+#greeter-wrapper=
+#guest-wrapper=
+#display-setup-script=
+#display-stopped-script=
+#greeter-setup-script=
+#session-setup-script=
+#session-cleanup-script=
+#autologin-guest=false
+#autologin-user=
+#autologin-user-timeout=0
+#autologin-in-background=false
+#autologin-session=
+#exit-on-failure=false
+
+#
+# XDMCP Server configuration
+#
+# enabled = True if XDMCP connections should be allowed
+# port = UDP/IP port to listen for connections on
+# listen-address = Host/address to listen for XDMCP connections (use all addresses if not present)
+# key = Authentication key to use for XDM-AUTHENTICATION-1 or blank to not use authentication (stored in keys.conf)
+# hostname = Hostname to report to XDMCP clients (defaults to system hostname if unset)
+#
+# The authentication key is a 56 bit DES key specified in hex as 0xnnnnnnnnnnnnnn.  Alternatively
+# it can be a word and the first 7 characters are used as the key.
+#
+[XDMCPServer]
+#enabled=false
+#port=177
+#listen-address=
+#key=
+#hostname=
+
+#
+# VNC Server configuration
+#
+# enabled = True if VNC connections should be allowed
+# command = Command to run Xvnc server with
+# port = TCP/IP port to listen for connections on
+# listen-address = Host/address to listen for VNC connections (use all addresses if not present)
+# width = Width of display to use
+# height = Height of display to use
+# depth = Color depth of display to use
+#
+[VNCServer]
+#enabled=false
+#command=Xvnc
+#port=5900
+#listen-address=
+#width=1024
+#height=768
+#depth=8