sudo aptitude reinstall flashplugin-nonfree
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Reading extended state information       
Initializing package states... Done
Writing extended state information... Done
The following packages will be REINSTALLED:
  flashplugin-nonfree 
The following partially installed packages will be configured:
  nspluginwrapper 
0 packages upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 56 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.
E: I wasn't able to locate file for the flashplugin-nonfree package. This might mean you need to manually fix this package.
Writing extended state information... Done
E: I wasn't able to locate file for the flashplugin-nonfree package. This might mean you need to manually fix this package.
E: Internal error: couldn't generate list of packages to download