Download 64-bit flash from here.

If you have flashplugin-nonfree installed, now is a good time to remove it as we will be using the labs version:

~$ sudo apt-get remove flashplugin-nonfree


This leaves behind some junk. To remove them:

cd /usr/lib
sudo find . -name "npwrapper.libflashplayer.so" | xargs rm


And now install the plugin:

cp path_to_so_file_you_extracted.so /usr/lib/firefox/plugins


Start firefox and have fun. Pandora.com no longer crashes:

And Hulu.com is working awesome:

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For sound I had to:


echo "options snd-hda-intel model=auto probe_mask=1" >> /etc/modprobe.d/options
modprobe snd-hda-intel


Then everything was good. Taken from this thread.

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3. Flash 64-bit on Ubuntu Intrepid