In Synaptic, look for flashplugin-nonfree, uninstall it, then look for adobe-flashplugin, and install that.
Linux Mint 8 RC1 = Nice
'apt install' can be used on Linux Mint as a shortcut for 'sudo apt-get install'. 'apt x' can be used for various other apt commands as well.
When a problem is solved, please add [SOLVED] to your thread title.