Everytime I boot up my ubuntu 12.10, I get a black console screen.
I need to login in tty, and restart lightdm :
sudo service lightdm restart
Then the GUI lightdm login screen appears as expected.
How to solve this annoying problem ?
Finally, I solved the problem by :
Ps : firing the command
This issue could be related to the use of a SSD.
If the first solution doesn't work for you, another workaround is to delay the startup of lightdm.
and just BEFORE exec lightm, insert this single line :
Adjust the time (in seconds) depending on your needs (2 sec works for me). Save the file, and restart !
Found this solution here : http://www.webupd8.org/2013/01/ubuntu-lightdm-black-screen-when-using.html