Sound/video installations

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http://askubuntu.com – WOW, I'm having so many problems with audio/video applications working properly.Tried VLC, which I had prior to 12.04 and it worked well, now it doesn't have sound in vma files. Tried GnomeMplayer and can't get it to open once installed. Rhytmbox was default player and I deleted it when trying to use VLC. I have been using Ubuntu for about 6 months and was content with it until I upgraded to 12.04. Now, I'm completely lost. PLEASE, is there anyone who can offer sound advice/solutions? P.S There are many other questions I have as well concerning Ubuntu operation. You may contact me @ 69Rixter@g (HowTos)