I was impacted by this on 2 VM's I have (while using lightdm-gtk-greeter). Both 
of them have been upgraded from Xubuntu 20.04 to Xubuntu 20.10. After the 
update, the effects were as follows:
1) one of the VMs (VMWare) lacked the icons and wallpaper on the greeter page, 
but functionally, everything was working, I was able to login.
2) one of the VM's (Virtualbox) entered in a loop in which tried to start the 
lightdm-gtk-greeter 5 times, without success, resulting in a black screen. I 
checked the logs in /var/log/ligntdm

I was running version 2.0.6-0ubuntu1 on BOTH VM's.
I was able to bypss this by uninstalling lightdm-gtk-greeter and installing 
unity-greeter.
I enabled the pre-released updates and installed the lightdm-gtk-greeter 
version 2.0.6-0ubuntu2
Note the 2 at the end.

After installing this newer version of the package, the problem was instantly 
solved, and I was able to switch back to lightdm-gtk-greeter without any issue. 
Icons were visible again, wallpaper was visible again, and I did not have a 
black screen anymore.
I confirm the fix is working, at least for the lightdm-gtk-greeter package.
Thanks for this fix, when the new version will be present in the official 
channels, I will upgrade to 20.10 all my fleet.

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https://bugs.launchpad.net/bugs/1890394

Title:
  Lightdm-gtk-greeter coredump during boot with recent systemd versions

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