keyboard volume control ubuntu not working

If you are a Linux newbie, you may want to read about Wubi (installation) of Ubuntu

Linux for Windows users – Wubi Installation

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If at all you find the keyboard shortcut to volume control – Fn+Pg Up and Fn+Pg Dn – responding to the key press but not altering the sound level, it most probably that you have tweaked something not knowing what its result would be.

TO restore to normalcy, goto System -> Preferences -> Sounds

Under Default Mixer Tracks select Playback and Master under this and select OK and the key press should now alter the sound level.

If you want to make sure that Playback-Master is the control rightclick on the volume control icon next to the sate and time display and select Open Volume Control. Now modify the controlled stream by selecting in File-> Change Device. You should select the one which alters the sound level.