Google for ubuntu+flash
I then chose the help.ubuntu.com sight
https://help.ubuntu.com/community/RestrictedFormats/Flash
Done what was said in Ubuntu 7.10 ...
In <System> <Administration> <Synaptic> <Settings><Repositories> made sure
Multiverse was checked
Then done a <Search> in Synaptic for "flashplugin-nonfree" like the
instructions say and installed it.

One of the tricks I use to find a specific piece of software for Ubuntu is
do a Google search for
ubuntu+softwarename
If that don't work I try
linux+softwarename