lightdm

lightdm [options]

-c CONFIG
    Use specified configuration file

-d
    Print debugging messages

--test-mode
    Run as unprivileged user for testing

--show-config
    Show configuration values and exit

--pid-file=FILE
    Write PID to file

--log-dir=DIR
    Directory for log files

--run-dir=DIR
    Directory for runtime data

--cache-dir=DIR
    Directory for cached data

-v, --version
    Show version information

LightDM is a lightweight, cross-desktop display manager that provides a graphical login interface. It supports various desktop environments and window managers through customizable greeters. LightDM handles user authentication, session selection, and launching the chosen desktop environment.

Usually managed by systemd/init, not run directly. Greeter customization requires additional packages. Some features may require specific PAM configuration.

LightDM supports multiple greeters including: lightdm-gtk-greeter (GTK-based), lightdm-webkit2-greeter (web-based themes), slick-greeter (Linux Mint), and unity-greeter (Ubuntu).

Main configuration file is /etc/lightdm/lightdm.conf. Users and seats can be configured in /etc/lightdm/users.conf and greeter settings in greeter-specific config files.

dm-tool(1), gdm(1), sddm(1), kdm(1), xdm(1)