[LightDM] Setting the default login for LightDM

[J.L.M.]

I have just switched from SLiM to LightDM. When LightDM starts up, it
displays userX, but I wish to log in as userY. So, I click on the name,
select "other..." and then type in userY. I am able to log in fine, but
when I log out, it displays userX again.

I have renamed userX just to see, and it uses the new userX name. I wish
for LightDM to display userY, as that is the login I will always use.

I see that in /var/lib/lightdm/.cache/lightdm-gtk-greeter/state,
last-user=userY. I have also set greeter-hide-users=false in
/etc/lightdm/lightdm.conf. I am running LightDM 1:1.18.1-2 on Arch Linux.

Please let me know how I can get it to display userY by default.

Thanks.
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