ubuntu+youtube sound

Do you have sound in general?

Very strange, assuming you have videos it may be a bug in flash. See this link https://launchpad.net/distros/ubuntu/+source/flashplugin-nonfree/+bug/29760 seems you can fix it yourself look at this thread http://ubuntuforums.org/showthread.php?t=204022

Rgds
Chris

Have you tried

# Flash also looks for /usr/lib/libesd.so.1
sudo ln -s /usr/lib/libesd.so.0 /usr/lib/libesd.so.1

Does the file libesd.so.1 exist and link to the so.0 one?

# Flash expects /tmp/.esd/socket to exist.
sudo mkdir -p /tmp/.esd/
sudo touch /tmp/.esd/socket

Have you created this folder and file?

Ok, so do the following

Top right hand corner press Applications -> Accessories -> Terminal.

Enter the following

sudo ln -s /usr/lib/libesd.so.0 /usr/lib/libesd.so.1

and press enter, you will be asked for your password - this will be the one you log in with.

Then enter the next command

sudo mkdir -p /tmp/.esd/

and press enter and then enter the next command and press enter

sudo touch /tmp/.esd/socket

From looking at the big this should sort out the problem. What version of Ubuntu are you running also?

If the previous commands didn't fix it try installing Google Chrome and see if youtube will work then. I think it is the Flash and firefox issue. You can also try reinstalling firefox and flash again.

Try this also http://ubuntuguide.org/wiki/Dapper#How_to_install_Flash_Player_.28Macromedia_Flash.29_Plug-in_for_Mozilla_Firefox its for Dapper but may work

my friend had major problems with anything flash related on meercat. He went back to 10.04