GDM (the GNOME Display Manager) provides a simpler to use alternative display manager for the X Window System's XDM.
The X Window System by default uses the XDM display manager. However, resolving XDM configuration issues typically involves editing a configuration file. GDM allows users to customize or troubleshoot settings without having to resort to a command line. Users can pick their session type on a per-login basis. GDM 2.38.0 is the last version that features easy customization with themes, further releases, no more support themes.
Read more about GNOME Display Manager: Hidden Features
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