sddm hangs in Debian/Trixie

[Gary Dale]

I'm running Debian/Trixie on an AMD64 system.

After doing a full-upgrade this morning, I rebooted my system. It gets 
to the sddm service being started then goes no further. It hangs and is 
not responsive to the keyboard. I had to install lightdm and make it my 
default desktop manager to get back to my desktop.