This is due to network problems as confirmed by multiple users of the flashplugin-nonfree source package in freenode/#ubuntu over the past several months.
** Changed in: flashplugin-nonfree (Ubuntu)
Importance: Untriaged => Low
Status: Unconfirmed => Rejected
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flashplugin-nonfree does not install
https://launchpad.net/bugs/50284
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