E: The package adobe-flashplugin needs to be reinstalled, but I can't find an archive for it. Ubuntu 9.10
after a lot of googling...finally!
$ sudo rm /var/lib/dpkg/info/adobe-flashplugin.prerm # Deletes a troublesome config file
$ sudo dpkg-reconfigure adobe-flashplugin --force # Force-reconfigures adobe-flashplugin
$ sudo dpkg --purge --force-all adobe-flashplugin # Force-removes adobe-flashplugin
$ sudo apt-get install flashplugin-nonfree # Installs flashplayer the easy way
cheers ;)