Installing flash on Ubuntu is pretty straight forward.  Type the following command into a terminal and press enter and away you go.

sudo apt-get install flashplugin-installer

On Fedora need to do the following

(64-bit)

sudo yum install http://linuxdownload.adobe.com/adobe-release/adobe-release-x86_64-1.0-1.noarch.rpm -y

(32-bit)

sudo yum install http://linuxdownload.adobe.com/adobe-release/adobe-release-i386-1.0-1.noarch.rpm -y

And install the Adobe Flash web browser plugin.  The first command imports the GPG key for the Adobe Flash plugin repository and the second command installs the plugin itself.

sudo rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-adobe-linux 
sudo yum install flash-plugin -y