lubuntu 13.04 has audio n video codecs
so Ubuntu comes with restricted codecs installed by default..... I just installed it and was able to play n watch videos out of the box
Monitor: LG flatron w1954s 22", mobo: G31-m7 series, CPU: Intel LGA 775 Intel core duo 2 2,66GHZ, RAM: 3GB, GPU: ATI Radeom HD 2400, Storage: 500GB SATA and 80GB IDE, Windows 7 ultimate and Ubuntu