HOWTO Fix error on YouTube "couldn't find plugin" in Chrome on Linux Mint 13 64 bit 
I found that You Tube videos wouldn't play and the video window just displayed a "couldn't load plugin" message. Don't know what caused this, but this is how I fixed.

1. Open new tab in Chrome, type in: about:plugins in the URL bar and press enter.
2. Disable "libprepflashplayer". (This may be all you need to do as other report this as fixing the issue)
3. Find the Flash plugin area and it should be complaining that you need to update the version. Click the link it displays and it should load a page on Adobe's website.
4. Download the .tar.gz file for Linux 64 bit. (For some reason .deb is not offered?)
5. Extract the contents of the file:
tar -zxvf install_flash_player_11_linux.x86_64.tar.gz
6. If you read README.txt is has install instructions, but all I did was (as per instructions):
find where libflashplayer.so resides:
locate libflashplayer.so
move libflashplayer.so to /opt/mint-flashplugin-11/:
sudo mv libflashplayer.so /opt/mint-libflashplugin-11/
copy contents of usr/ to /usr:
sudo cp -r usr /usr
7. Restart Chrome.

This was the fix for me.

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