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I have a desktop computer(HP Intel Core 2 Duo). After installing Ubuntu 9.10, I have no sound.

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check grub.conf file for the latest kernel version –  ukanth Nov 27 '09 at 9:52
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As a first step, make sure you have set the volume higher than 0%.

If you upgraded Ubuntu and it worked on 9.04 but not anymore in 9.10 check that you are booting the right kernel: vmlinuz-2.6.31-(something) and not the one from previous version vmlinuz-2.6.28-(something).

Second step is to kick the pulseaudio dæmon: killall pulseaudio. Pulseaudio will restart itself and audio should be fixed after that. At least until the next reboot.

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Also, check cables! ;) –  Aaaaaaaaaha ERLEBNIS Nov 27 '09 at 13:02
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