Ubuntu 12.04 - Howto downgrade vsftpd?

downgrade ubuntu ftp

What you are after is not pinning, but holding.

Holding a package can be achieved with 

  echo vsftpd hold | dpkg --set-selections

See Ubuntu Pinning Howto

Edit: as for the original question it would probably be easiest to uninstall whatever version is there and download the version you need from Ubuntu Main pool and install it with dpkg -i. Afterwards hold to it as describe above.

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