I've recently installed ubuntu 13.10 64bit on a desktop (UEFI mode). After the plymouth splash i get a black screen. After some experiments I found a temporary solution: switch back to tty1 and ...
I have a multiseat configuration with 2 Nvidia cards. Everything was working under 11.10 but since the upgrade I'm having trouble with ligtdm/unity-greeter. Either lightdm or the unity-greeter now ...