[Solved] How to display default user in Lightdm on login?

[M22]

Hi,

I'm using XFCE, and have created a guest account with the name Guest, and removed the password.

How do I display this "Guest" name by default, instead of my name during the login? (Already made the greeter-hide-users=false in the lightdm.conf)

Just wanted the other people at home to be able to simply press login to begin, instead of choosing the user and select Guest and then login. By default, it is showing my name for login.

Thank you for any information.

[fabien]

There may be a simpler solution, but here is the solution I found and how I found it.

In /etc/lightdm/lightdm.conf I spotted the line

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# greeter-setup-script = Script to run when starting a greeter (runs as root)

This looked like something usable to reconfigure lightdm when it starts. So I first looked at what we had on hand. The Bash set command displays the variables that have been set.
So I made a script /etc/lightdm/custom-greeter-setup-script:

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#!/usr/bin/env bash

set >/tmp/custLightdm

and made it executable:

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#> chmod +x /etc/lightdm/custom-greeter-setup-script

and added this line to /etc/lightdm/lightdm.conf:

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greeter-setup-script=/etc/lightdm/custom-greeter-setup-script

and then restarted lightdm.
In /tmp/custLightdm I saw the line

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HOME=/var/lib/lightdm

In /var/lib/lightdm/ I found the file /var/lib/lightdm/.cache/lightdm-gtk-greeter/state which contains

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$> cat /var/lib/lightdm/.cache/lightdm-gtk-greeter/state 
[greeter]
last-user=myusername
last-session=lightdm-xsession

This is how lightdm saves the last user which is then used when opening a new session.

So I changed /etc/lightdm/custom-greeter-setup-script with:

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#!/usr/bin/env bash

sed -i 's/^last-user=.\+$/last-user=defaultusername/' /var/lib/lightdm/.cache/lightdm-gtk-greeter/state

This replaces any user name with the username you want to use as default. Just change defaultusername to this name, of course.

[M22]

Hi, @fabien. Very much thanks for your detailed reply. And not just reply but also how you have come to that. Nice!

[fabien]

You're welcome!
Please mark your topic as [Solved] if you validate the solution.