Howto install the new alpha of Adobe’s Flash 10 on 64bit Ubuntu 8.10.

Download the plugin and extract it somewhere.

Uninstall flashplugin-nonfree and nspluginwrapper using Synaptic “Mark for Complete Removal“.

Then copy the libflashplayer.so you extracted earlier to /usr/lib64/mozilla/plugins/ .

Edit: Gentoo users should copy to /usr/lib64/mozilla-firefox/plugins/

That should be it!