Mozilla Firefox won't play YouTube videos, tried all obvious things

Can you give the output of:

lsb_release -a; uname -a; dpkg -l | egrep 'flash|gnash|swf|spark'

Thanks

 lsb_release -a; uname -a; dpkg -l | egrep 'flash|gnash|swf|spark'
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu precise (development branch)
Release: 12.04
Codename: precise
Linux NEUROVORTEX 3.2.0-21-generic #34-Ubuntu SMP Thu Mar 29 22:13:29 UTC 2012 i686 athlon i386 GNU/Linux
ii adobe-flash-properties-gtk 11.2.202.228-0precise1 GTK+ control panel for Adobe Flash Player plugin version 11
ii adobe-flash-properties-kde 11.2.202.228-0precise1 KDE control panel Adobe Flash Player plugin version 11
ii adobe-flashplugin 11.2.202.228-0precise1 Adobe Flash Player plugin version 11
rc flashplugin-installer 11.2.202.228ubuntu1 Adobe Flash Player plugin installer

Why are you running precise if you can't even resolve simple browser plugin issues? Prcise is not ready and not stable at all...

ok run:

sudo apt-get --purge remove adobe-flash-properties-gtk adobe-flash-properties-kde adobe-flashplugin

sudo dpkg -P flashplugin-installer; sudo apt-get clean

sudo apt-get update

sudo apt-get install adobe-flashplugin

Close al browsers and rerun, you should now be ok

I did every command you said exactly. Each command finished without an error message. Then I rebooted. It's still the same.
I don't know what you mean by "running precise" I just installed this OS and am trying to get it to work.
I appreciate the suggestion, but it didn't solve my issue! Do you have any other ideas what it might be?

Precise is the pre-release beta of Ubuntu 12.04 due out next month. It's not stable and not ready so you wil get a lot of issues up to and even a few weeks after release.

Can you give the output of:

dpkg -l | egrep 'flash|gnash|swf|spark'

Thanks

I see. I first installed 11.10 and was having this problem, so I was hoping that maybe upgrading to 12.04 might fix it, but it didn't obviously. Other than that I have not run into any problems running 12.04! Here is the output:

 dpkg -l | egrep 'flash|gnash|swf|spark'
ii adobe-flash-properties-gtk 11.2.202.228-0precise1 GTK+ control panel for Adobe Flash Player plugin version 11
ii adobe-flashplugin 11.2.202.228-0precise1 Adobe Flash Player plugin version 11
rc flashplugin-installer 11.2.202.228ubuntu1 Adobe Flash Player plugin installer

sudo dpkg -P flashplugin-installer

May help. Remember to restart the browser each time

I ran the commands you suggested, and this is very strange. Sometime videos play, sometimes they don't depending on where the link was. If the link was in my main subscription area, the video plays, but if I click a video link anywhere other than that, the same thing happens: the page loads but the area where the video is supposed to play stays blank. It's an improvement, anyways! At least now I can watch more videos other than just the one. I appreciate your help. Do you have any idea on what could be causing this, and how I might be able to get Firefox to play YouTube videos regardless of where on the web site the link was?

Thakns!!

CORRECTION: and this is even stranger than what I thought it was..
The first video I clicked on in my subscription area played, and I sort of jumped the gun in saying that videos from my subscription area play, because actually only the first video that I clicked played, after that, only that video and the other one that I could play before would play, none others will. At least I can watch 2 videos now instead of just 1 <smirk>. The new one I can play is just some random vlogger, and has no connection that I can think of to the other video that I can play with the sexy model.

Are other browsers ok?

I just installed and tried Opera, and the exact same thing happened! Only, in opera not even the sexy model video plays! Surely someone has had this sort of problem before? Maybe it has something to do with because I am using a very old video card (RAGE Turbo Pro 3 or something)

I FINALLY got my browser to be able to play YouTUbe videos!! I'm so happy!!!!!! I do appreciate your efforts on my behalf, and thank you for taking the time to help me troubleshoot this problem. What ended up working was: I DISABLED Shockwave Flash, iTunes Application Detector, and WIndows Media Player in the Add-ons Manager. I don't know for sure which one of those did the trick, most likely Shockwave Flash I am thinking. I am using VLC media player, Quicktime Plugin, and DivX web player. I have read that the latest releases of Adobe programs have been plagued with bugs.. at any rate, I can do everything fine without Adobe so it's all good.

Oh one more thing, before I disabled Shockwave Flash I also installed Gnash.

I think an update to the flash plug-in for Linux some time in the last few months broke it for most YouTube videos on some computers.

An old computer with an AMD Athlon CPU, running Lucid, some time since the start of 2012 lost the ability to play most youtube videos. A few would play, the rest just showed plain black rectangles with no controls or right-click menu (other than generic Firefox menu). Fresh install with Precise made no difference. Firefox, Chrome, made no difference. Chromium (closed source) browser, though, worked, with its built-in copy of Flash. Also, opting in to the HTML5 mode on www.youtube.com/htm5 and/or disabling Flash would make the videos play using the youtube/Firefox/html5 player mode (no Flash).

Also tried Puppy Slacko with SeaMonkey and Adobe Flash, same results as Ubuntu: no joy.

On other computers I use, Flash plays everything it is supposed to as far as I can tell, same as always.

Tried all the solutions and none worked, i'm also on a computer with AMD Athlon CPU, but running precise, exact same problem, some vids would play but most won't
tried using tar from adobe, apt from adobe, flash aid plugin, gnash, software center, synaptic, but flash never apeared on add-ons manager