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It looks to me like you were trying to install the 12.10 Quantal version. That release has been EOL for a very long time now. If you want the Adobe flash plugin for Ubuntu MATE 16.04, the easiest way to do it is: sudo apt update sudo apt install ubuntu-restricted-addons
A virtual package allows for a common name to be depended upon by other packages even though several things might provide that service/function. There's more than one way in the package archive to install Adobe Flash and each package causes the virtual package to appear as installed. Another example of such is ubuntu-default-settings. In a different tool ...
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