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Many times , when i open my pc the sound is dead , though when i go to system settings / audio , everything seems right. when I restart my computer the sound is back to normal again . I saw some comments with commands , but I don't know where to write these commands . Please help me with both of the problems : 1. Where do I write the commands ? (i probably need a full explanation) 2. Is there any command to troubleshoot this ?

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To start, your question regarding where to place commands:

There is an application packaged with every ubuntu variant that has "terminal" somewhere in the title.

  • gnome-terminal
  • kterminal
  • lxterm

This is your interface to the command line or a text only terminal on the system. I will assume you're coming from a Windows background, and the easiest (But not necessarily proper) comparison would be to the windows command prompt.

note The author does not condone copy/pasting commands into a terminal that you do not understand. This can have irreversible side effects on your system and should be performed with supervision of an experienced user. If one is not available, I recommend you join #ubuntu on irc.freenode.net and ask for a mentor.

Now on to troubleshooting your sound issues:

Reference the following community documentation: Community Documentation: Sound Troubleshooting Procedure

The easiest method to troubleshoot is to force pulse audio to restart

1A. If you are using Ubuntu 12.04.3 LTS (Precise Pangolin) or later, try this first:

killall pulseaudio; rm -r ~/.config/pulse/* ; rm -r ~/.pulse*

wait ten seconds, then run this:

pulseaudio -k 

1B. Should the approach above fail to correct the problem (it is only known to work on some variations), you can try this next. If you are using Ubuntu 12.04.3 LTS (Precise Pangolin) or later:

killall pulseaudio; rm -r ~/.config/pulse/* ; rm -r ~/.pulse*

wait 10 seconds, then reboot (putting the machine to sleep is not enough -- fully power it off and then back on). Make sure to save your work first.

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