This was discussed in very related earlier thread: Byzantium configuration - #4 by guru, therefore finding it helpful. Also apt info gdm3 will show you clearly on why this package is not recommended on Librem 5. Just type: Yes (after: sudo apt purge gdm3), don’t close your eyes and hit Enter key (now you may close your eyes). Followed by: sudo apt autoremove, type: Yes, don’t close your eyes (not yet) and hit Enter key.
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