Comment 26 for bug 429841

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Paul van Genderen (paulvg) wrote : Re: broken packaging: package flashplugin-nonfree 10.0.22.87ubuntu1 failed to install/upgrade: (breaks upgrade)

Yes, you can safely remove /var/cache/flashplugin-nonfree/install_flash_player_9.tar.gz . If you really need Flash, you can install it with
sudo aptitude install flashplugin-installer