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sound - Audio not working in ubuntu 12.04 - Ask Ubuntu
https://askubuntu.com/questions/397799/audio-not-working-in-ubuntu-12-04
lspci | grep -i audio this is very suspect - do you really have two video cards from different manufacturers ? Which of these appear in output of : sudo lshw ubuntu releases new versions every 6 months (12.04 was released month 4 of 2012) so 12.04 is 18 months old - I also experienced sound issues on earlier releases - ubuntu 13.10 seems fine.
Gloobus Preview for Ubuntu 12.04 | Gloobus Studio
http://gloobus.net/gloobus-preview-for-ubuntu-12-04/
Gloobus Preview was recently fixed so it now works with Ubuntu 12.04 too. Besides the Ubuntu 12.04 fix, the latest Gloobus Preview from BZR comes with GTK3 support , support for password-protected documents, a rewritten documents plugin , WebM support , fixed ttf, pdf and video plugins and other fixes.
Index of /releases/12.04 - Ubuntu
https://old-releases.ubuntu.com/releases/12.04/
Ubuntu 12.04.3 LTS (Precise Pangolin) Select an image. Ubuntu is distributed on eight types of images described below. Desktop CD. The desktop CD allows you to try Ubuntu without changing your computer at all, and at your option to install it permanently later. This type of CD is what most people will want to use.
Ubuntu 12.04.5 LTS Download | TechSpot
https://www.techspot.com/downloads/5067-ubuntu-lts.html
Ubuntu 12.04 LTS ships with an updated kernel moving from the mainline v3.0 series to the mainline v3.2 series. At release we are shipping with the Ubuntu 3.2.0-23.36 kernel which is based on the ...
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