I replaced Windows 8 with Ubuntu. But now when I watch YouTube videos the video player does not work very well in 1080p. It sometimes does not load or stops and buffers every 30 seconds or so. Sometimes the video is slower than the audio. When I press pause it sometimes runs a few seconds longer, also the video is sometimes not running smoothly. All in all it's a very ugly experience. I hope someone can help me. Please keep in mind that I am an unexperienced user. Thank you.