For everyone running ubuntu on a laptop with a stereo audio adapter but only one built-in speaker, like the Acer Aspire series, here's how you create a mono profile so you can hear both channels through the single built-in speaker:
In Terminal run:
at the prompt enter:Code:$ pacmd
Note your main sink's name so you can inset it into the following code:Code:>>> list-sinks
If you have entered the command correctly, you should be returned to the >>> prompt. Do not exit at this time.Code:>>> load-module module-remap-sink sink_name=mono master=[YOUR MAIN SINK'S NAME] channels=2 channel_map=mono,mono
Open Sound Preferences and chose "Remapped Internal Analog Stereo Mono"
You may want to reduce the master volume to prevent audio clipping.
The Mono setting will last as long as pacmd is running in Terminal. To make it permanent, add the command to the end of /etc/pulse/default.pa.
Hope this helps you enjoy ubuntu on your laptop.