I, too, had a 24.04 to 24.10 upgrade where LightDM repeatedly rebooted before logging in.
The release notes state the following.
“Switched back to Slick Greeter (replacing Arctica Greeter) due to race-condition in the boot process which results in the display manager failing to initialise.”
So I looked in /etc/lightdm/lightdm.conf.d/ and there was no Slick Greeter setting.
However, 90-arctica-greeter.conf was still there.
I opened 90-arctica-greeter.conf with a text editor and modified greeter-session=arctica-greeter to greeter-session=slick-greeter and it worked fine.
I suspect this is due to Slick Greeter not being configured during the upgrade.
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