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After doing a clean install of Ubuntu 12.04 I realized the sound was missing as I played a YT video but couldn't hear a thing. I managed to troubleshoot that problem, got the sound working, then installed Cinnamon and a few applications from the Ubuntu Software Center then went back to play a video on YT but it crashed and has been ever since. I tried installing, re-installing the Adobe Flash Player, from the Ubuntu Software Centre, from their website but so far the problem persists.

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Can you try this one? Despite it's not the same problem, it may help. [… Try to look what plugins are install, it could help too! – luisgonzalez May 26 '12 at 23:20
Are you using an older processor? If so take a look at /proc/cpuinfo and see if flags include SSE2. – John S Gruber May 27 '12 at 2:26

Solution lies slightly away from package management. Adobe ships new version compiled with sse2 flag, so it is now defunct on older computers (like mine Sempron 2400+) Problem is solved by replacing by hand.

mkdir /tmp/install_flash
cd /tmp/install_flash/
tar -xvzf flashplayer11_1r102_63_linux.i386.tar.gz
sudo cp /usr/lib/adobe-flashplugin/


Also, you can download plugin from official site from 'archive' section.

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Why not try FOSS alternatives: gnash or Lightspark

To install lightspark:

    sudo add-apt-repository ppa:sparkers/daily 
    sudo apt-get update 
    sudo apt-get install lightspark browser-plugin-lightspark
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I also had Flash Player problems after a clean 12.04 install on my brand new Intel Core i7 system (running 32-bit i386 Ubuntu), and tried re-installing the Flash player (several times).

One thing I found (with the help of the previous answer) was that the hadn't been installed at all.

It appears that the flashplugin-installer package (which is what I used) didn't actually install the flash player.

The adobe-flashplugin package does install, however that didn't seem to fix the problem.

I then tried the fix described above... that also didn't help.

The adobe-flash-properties-kde/gtk package s also didn't shed any light.

Hope this helps somebody.

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