I am running Ubuntu 11.10. I used the directions here to replace Unity with Gnome. It seemed to work fine until the end of step 2 when I rebooted the computer. When I chose the default option, I just got a black screen. When I choose the restore option and then "Restore normal boot" I get
Starting load fallback graphics devices [fail] Starting GNOME Display Manager [ok] Starting Userspace bootsplash [ok] Stopping GNOME Display Manager [ok] Stopping Userspace bootsplash [ok] Starting web server apach22 [fail]
(among a lot of OKs)
It finally gets to Stopping System V runlevel compatibility [ok] where it hangs. I left it overnight and just had a blank screen when I checked it in the morning.
I can "Drop to root shell prompt" and "Drop to root shell prompt with networking". I did see here that one should be able to fix the problem by choosing remount and then doing
apt-get install lightdm
I tried this as root shell with and without networking and got the message
Err http://us.archive.ubuntu.com/ubuntu/ oneric-updates/main lightdm i386 1.0.6-0ubuntu1.7 Could not resolve 'us.archive.ubuntu.com/ubuntu'
What is the best way to resolve this problem?