Unpacking libnss3-1d (from .../libnss3-1d_3.13.1.with.ckbi.1.88-1ubuntu3_i386.deb) ...
Selecting previously unselected package libnspr4-0d.
Unpacking libnspr4-0d (from .../libnspr4-0d_4.8.9-1ubuntu2_i386.deb) ...
Selecting previously unselected package flashplugin-installer.
Unpacking flashplugin-installer (from .../flashplugin-installer_11.1.102.55ubuntu4_i386.deb) ...
Selecting previously unselected package flashplugin-downloader.
Unpacking flashplugin-downloader (from .../flashplugin-downloader_11.1.102.55ubuntu4_i386.deb) ...
Setting up libnss3-1d (3.13.1.with.ckbi.1.88-1ubuntu3) ...
Setting up libnspr4-0d (4.8.9-1ubuntu2) ...
Setting up flashplugin-installer (11.1.102.55ubuntu4) ...
Downloading...
--2012-02-24 14:12:54--  http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_11.1.102.55.orig.tar.gz
Resolving archive.canonical.com (archive.canonical.com)... 91.189.92.191, 91.189.88.33
Connecting to archive.canonical.com (archive.canonical.com)|91.189.92.191|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2012-02-24 14:12:54 ERROR 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
dpkg: dependency problems prevent configuration of flashplugin-downloader:
 flashplugin-downloader depends on flashplugin-installer (>= 11.1.102.55ubuntu3); however:
  Package flashplugin-installer is not configured yet.
dpkg: error processing flashplugin-downloader (--configure):
 dependency problems - leaving unconfigured