I have installed lightdm but can't find lightdm.conf file in
/etc/lightdm/
/usr/share/lightdm/
How to configure lightdm now ?
Install the greeter settings app:
sudo apt install lightdm-gtk-greeter-settings
Once installed, check: /etc/lightdm/lightdm-gtk-greeter.conf
You can also launch the Greeter Settings from the app menu. Search lightdm and it should offer it right up.
Hi @Aravisian, Thanks for replying
I have another query, I wasn't able to acess power menu for restart/power off in gdm3 and even in lightdm I can't do this ?
Please launch the LightDM Gtk Greeter from the App menu.
Enter your system PW to allow Root access...
Now click the Panel tab
Click the add button (+)
A popup will open called Indicator Properties
Select Indicator at the top if not already selected.
From the drop down menu next to it, scroll down to "Power Menu" and click it. Now click the OK button at the bottom of the popup.
You should now see "Power menu" listed in the Panel Tabs indicators. You can also use the arrow keys to change their positioning.
Once done, click the Save button at the bottom (essential!)
You should now have the Power Options on your Login Window.
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What is the output of
grep 'ExecStart=' /etc/systemd/system/display-manager.service
Idk how, but it has started working now 
!