I had connected my laptop to PC. After changing the default sound settings from HDMI back to inbuilt speakers, I can play videos on laptop properly. However, the videos on youtube play with no sound. Please help.
I have installed adobe flash plugins and codecs in ubuntu.
Best Answer
solved: https://ubuntuforums.org/showthread.php?t=2369453
(sound profiles - pulseaudio volume control) 'configuration' tab, turn profile hdmi 'off' built in audio: profile analog stereo output finally restart machine