I could not hear audio.I install ubuntu 10 linux lucid and windows7.I am able to hear audio in windows but no sound in ubuntu. I have no sound card. How could I hear sound? My computers mother board is Gigabyte H55M-S2v.
Follow the instructions provided at https://wiki.ubuntu.com/DebuggingSoundProblems -- most likely it is something simple like muted audio or the wrong output setting.
To start troubleshooting the problem, run