Comment 8 for bug 218597

Please try to remove it using either apt-get remove --purge flashplugin-nonfree if that fails to work please try sudo dpkg -r flashplugin-nonfree and than once removed please install the package again when you have a few minutes of connection hopfully if im right its just a corrupt download due to failure of being connected and dpkg didnt like it. sometime in next ten days i will ping head ubuntu mozilla dev about this issue and see what he would like to happen.
Im also reporting this against apt.