Comment 5 for bug 875575

The #2 comment in https://bugs.launchpad.net/ubuntu/+source/flashplugin-nonfree/+bug/870643

has the same error message that you had [although yours was partially in Italian] in your VarLogDistupgradeApttermlog.gz

which is as follows:

Setting up flashplugin-downloader (11.0.1.152ubuntu1) ...

Downloading...

--2011-10-16 10:29:18-- http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_11.0.1.152.orig.tar.gz

Risoluzione di archive.canonical.com... fallito: Nome o servizio sconosciuto.

wget: impossibile risolvere l'indirizzo dell'host "archive.canonical.com"

download failed

The Flash plugin is NOT installed.

dpkg: error processing flashplugin-downloader (--configure):

 subprocess installed post-installation script returned error exit status 1

dpkg: dependency problems prevent configuration of flashplugin-installer:

 flashplugin-installer depends on flashplugin-downloader (>= 11.0.1.152ubuntu1); however:

  Package flashplugin-downloader is not configured yet.

dpkg: error processing flashplugin-installer (--configure):

 dependency problems - leaving unconfigured