I had no sound problems before I installed the mscorefonts. Now, whilst there is no problem with audio on locally played multimedia files, I can't get sound on websites like YouTube - only the video. I also got the yellow bulb icon in the system tray as described here I have since removed the mscorefonts and made sure to remove the flashplugin-installer in favour of the adobe flashplugin. Nothing seems to work. From above link:- I hope there is some solution as I am not in the mood for a reinstall of 12.04. (It's buggier than 11.10 imho). Edit: All sorted. Was an incorrect setting in 'Default audio device preferences' in audio setup.