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No sound on Compaq C700 running Ubuntu 8.10

After a recent Ubuntu update, my laptop suddenly stopped producing sound. Or, rather, the only sound it produced was a faint crackling.

It turns out that this was the result of the update muting my default sound device; the fix is to use alsamixer to unmute the channels. See this HOWTO for details; in my case I just skipped to part C, step 3 and had sound going again in a few seconds.