Hi everyone,
I'm using a second monitor while my laptop lid is closed. When the login screen appears at system startup, I enter my password and press Enter, but instead of logging in, the system shuts down.
This only happens when the lid is closed. If I open the lid, the system logs in normally.
Has anyone experienced this issue or know a fix?
Thanks in advance!
You might need to look into dconf-editor (would need to be installed separately) and edit some power settings that relate to lid closing actions while (presumably) on AC. I can't recall the exact location (and I can't check right now) but it should be somewhere along the following lines:
gsettings set org.gnome.settings-daemon.plugins.power lid-close-suspend-with-external-monitor 'nothing'
That is a command you could enter in the terminal that SHOULD change the behaviour of the laptop with an external monitor plugged in to do 'nothing'. But I can't verify immediately if that location is the same now as it used to be.
In dconf-editor, you can use the same but using a gui to find that location that's referenced in the command, and change settings from there.
EDIT: I'm doing a quick search and it's seeming that this may or may not work anymore in newer versions of gnome. I would like to extend my heartfelt gratitude to the Gnome developers once again for their continued success in changing everything all the time for definitely very good reasons.
You can try this guide:
Save the original file before editing it as backup.
Welcome to the Forum!
Does Your System run in Wayland or X11/Xorg?
What an excellent suggestion @applecheeks37 , you found where the hidden setting lie. This feature has caused me so much grief for years! Finally a resolution to the issue!
In order to make this change, I had to click on these two, turn off the toggle, then select from the drop-down boxes, BLANK. Then all I had to do, was click on APPLY after.
For those who use laptops as desktops like me, we are eternally grateful. 
Thank you all for your help and suggestions! The blank value works wonderfully.
My system runs in Wayland.
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