I can hear no sound from my laptop. I installed Ubuntu 14.04 2 days ago and at first everything worked fine, but after a reboot the sound stopped. I searched for 3 hours on google and tried everything I found, but nothing helped.
EDIT: I already tried the solution from the posted thread and it didn't help.
EDIT2: The sound does work on headphones. But it doesn't work on speakers. It's not a hardware problem.