I found that on Mate 20.0. lightDM GTK+ Greeter is a highly configurable login screen reminiscent of the classic GDM configuration. I have a configure this following path
usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf and edit this file
Greetings
Possibly might find some information here, possibly the check installed greeter command. Also link in article for switching. I may be thinking wrong if you are asking about a choice of greeters on boot screen.
Thank for your your feed back. This topics is so much help for everybody. I am really sorry, because i am not success. I am also try another way. When I got a success then I inform you.
Finally I got Successfully configure LightDM. First I got update & upgrade ubuntu mate.
Then Ican configure the follwing paths: /etc/lightdm/lightdm.conf.d
edit this file 50-manual-login.conf
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Just FYI. But Ubuntu uses a year.month format for releases, with 2000 being added to the year. This applies to all flavors of Ubuntu as well (ie. Ubuntu-MATE)
ie. 20.04 tells you it was the 2020-April release of Ubuntu or Ubuntu-MATE in this case.
The latest release is Ubuntu-MATE 22.10 which is the 2022-October release, with work progressing now on the lunar release which has an ETA for April 2023 - ie. it'll be Ubuntu-MATE 23.04
The first release on an even year is a LTS or long-term-support release, thus 20.04 & 22.04 were both LTS.