Although Canonical has done a great job with Ubuntu 11.10 Oneiric, It can always happen to run into some small hitch during the daily use of the entire system. One of the most bizarre problems that could happen is to get to the login screen LightDM, enter your credentials and not hear any sound after you log.
Although the volume is a ball and despite everything seems configured correctly, your speakers do not give off even a measly beep. The solution? Simply open the terminal and type:
sudo cp /usr/share/sounds/ubuntu/stereo/* /usr/share/sounds/
If anyone has had this problem and solved with this command, of course, please leave a comment confirms releasing their feedback on!