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LightDM GTK Greeter

LightDM GTK Greeter is a greeter that has moderate requirements (GTK).

This project is one of many greeters for LightDM.

About LightDM

LightDM is a cross-desktop display manager. A display manager is a daemon that:

  • Runs display servers (e.g. X) where necessary.
  • Runs greeters to allow users to pick which user account and session type to use.
  • Allows greeters to perform authentication using PAM.
  • Runs session processes once authentication is complete.
  • Provides remote graphical login options.

Key features of LightDM are:

  • Cross-desktop - supports different desktop technologies.
  • Supports different display technologies (X, Mir, Wayland ...).
  • Lightweight - low memory usage and fast performance.
  • Guest sessions.
  • Supports remote login (incoming - XDMCP, VNC, outgoing - XDMCP, pluggable).
  • Comprehensive test suite.

Configuration

LightDM configuration is provided by the following files:

/usr/share/lightdm/lightdm.conf.d/*.conf
/etc/lightdm/lightdm.conf.d/*.conf
/etc/lightdm/lightdm.conf

LightDM GTK Greeter uses lightdm-gtk-greeter.conf for its configuration.

System provided configuration should be stored in /usr/share/lightdm/lightdm.conf.d/. System administrators can override this configuration by adding files to /etc/lightdm/lightdm.conf.d/ and /etc/lightdm/lightdm.conf. Files are read in the above order and combined together to make the LightDM configuration.

For example, if a sysadmin wanted to override the system configured default session (provided in /usr/share/lightdm/lightdm.conf.d) they should make a file /etc/lightdm/lightdm.conf.d/50-myconfig.conf with the following:

[Seat:*]
user-session=mysession

Configuration is in keyfile format. For most installations you will want to change the keys in the [Seat:*] section as this applies to all seats on the system (normally just one). A configuration file showing all the possible keys is provided in data/lightdm.conf.

Questions

Questions about LightDM and LightDM GTK Greeter should be asked on the mailing list. All questions are welcome.

Stack Overflow and Ask Ubuntu are good sites for frequently asked questions.

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