This tutorial shows how you can install the Adobe Flash plugin 10 on a 64bit Ubuntu 8.04 desktop. Although Adobe does not provide a Flash 10 plugin for x86_64 Linux, this is possible with a little script provided by queleimporta.com.
I do not issue any guarantee that this will work for you!
1 Update The System
Make sure that your system is up-to-date. Go to System > Administration > Update Manager…
… and click on Install Updates to install the available updates (if the list is empty, click on Check first to make sure your system is really up-to-date):
Type in your password:
The system will then be updated.
It is possible that the system needs a restart after the update. If you see the blue restart icon in the taskbar, reboot the system:
2 Install Flash 10
Now open a terminal (Applications > Accessories > Terminal)…
… and download the script:
Then execute it as follows:
sudo sh ./flash10_en.sh
Afterwards, open/restart Firefox and type
in the address bar, and you should see a list of all installed Firefox plugins. If all went well, Flash 10 should be listed there as well.