Comment 2 for bug 42682

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sam tygier (samtygier) wrote :

avi is a container format and many different codecs can be used inside it. odds are that you don't have the required codec.

please see https://wiki.ubuntu.com/RestrictedFormats

if after installing all the codecs you still can't hear the sound please run totem (or which ever mediaplayer you are using) in a terminal, reopen the bug report, and paste any message hear.