I can hear the sound from my laptop speakers on the startup but after that when I try to play any music on VLC I don't hear any sound. I can't even hear any sound on youtube so it's not the problem with VLC. If I try running any sound by Guest user then it works.
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Triedalsamixer in terminal? Remove all of the M's by using the cursor keys to navigate below an output labeled as MM and tap M to unmute it. The cursor up and down keys can also be used to adjust the volume if necessary.

For more possible answer's, see here: No Sound in Ubuntu 12.04
Elder Geek
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Wilf
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If nothing works,reinstall the audio system. Run the following code:
sudo apt-get remove --purge alsa-base pulseaudio
sudo apt-get install alsa-base pulseaudio
sudo alsa force-reload
Hope that helps. !
ASCIIbetical
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