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Processing triggers for man-db ...
Setting up flashplugin-installer (11.1.102.63ubuntu2) ...
Downloading...
--2012-03-31 11:28:35--  http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_11.1.102.63.orig.tar.gz
Risoluzione di archive.canonical.com (archive.canonical.com)... 91.189.88.33, 91.189.92.191
Connessione a archive.canonical.com (archive.canonical.com)|91.189.88.33|:80... connesso.
Richiesta HTTP inviata, in attesa di risposta... 404 Not Found
2012-03-31 11:28:36 ERRORE 404: Not Found.

download failed
The Flash plugin is NOT installed.
dpkg: error processing flashplugin-installer (--configure):
 subprocess installed post-installation script returned error exit status 1
Setting up libqt4-designer (4:4.8.0-1ubuntu11) ...