Mint uses MDM by default, not LightDM, so there's no such thing as the default LightDM configuration for Mint.
Anyway, your old configuration might be saved in
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Ok, thanks. It looks like the background is simply replaced anyway. I updated another LMDE 1 machine and the same thing happened. I guess lightdm is not supported anymore. MDM seems to have installed itself somehow, and I had to remove it.
The strange thing is that on an older install, I was able to install mint-meta-debian-xfce, but on the other one, that package is not available. Why is that? Is it some repo that I forgot I installed?
An issue I'm seeing with the new mint update, when there are updates available the icon changes, and the packages to update show upon opening. But when I click to install the updates, it doesn't do anything. I'm having to do 'apt upgrade'.