Comment 10 for bug 409119

I had a similar problem today in maverick with the latest flash plugin update:

Preparing to replace flashplugin-installer 10.2.152.27ubuntu0.10.10.1 (using .../flashplugin-installer_10.2.153.1ubuntu0.10.10.1_i386.deb) ...
Unpacking replacement flashplugin-installer ...
Setting up flashplugin-installer (10.2.153.1ubuntu0.10.10.1) ...
Downloading...
--2011-03-24 07:59:05-- http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_10.2.153.1.orig.tar.gz
Resolving false... failed: Name or service not known.
wget: unable to resolve host address `false'
download failed
The Flash plugin is NOT installed.

The download failed for some other reason, and at least the previous flash version with the security hole has been removed.
However the package is considered as installed by apt/dpkg and in order to have a working flash plugin again the user has to either:
 - purge and reinstall the package
 - run "dpkg-reconfigure flashplugin-installer"