Comment 202 for bug 173890

Has anyone of you read the important notice above? :)

For all of you that complain, which repositories do you use?
Check if your repositories are up to date: https://launchpad.net/ubuntu/+archivemirrors
Otherwise, try switching to "Download from" -> "Main server" (at system -> administration -> software sources)
Close and Reload.

Then do this in terminal:
sudo apt-get clean
sudo apt-get autoclean
sudo apt-get update
sudo apt-get remove -y --purge flashplugin-nonfree
sudo apt-get install flashplugin-nonfree

The update to "9.0.48.0.2+really0ubuntu12.1" went well for amd64 gutsy gibbon.

"08:22:25 (51.72 KB/s) - `./install_flash_player_9_linux.tar.gz' saved [3036127/3036127]
Download done.
Flash Plugin installed."

$ apt-cache policy flashplugin-nonfree
flashplugin-nonfree:
  Installed: 9.0.48.0.2+really0ubuntu12.1
  Candidate: 9.0.48.0.2+really0ubuntu12.1
  Version table:
 *** 9.0.48.0.2+really0ubuntu12.1 0
        500 http://uk.archive.ubuntu.com gutsy-updates/multiverse Packages
        500 http://uk.archive.ubuntu.com gutsy-proposed/multiverse Packages
        100 /var/lib/dpkg/status
     9.0.48.0.2+really0ubuntu12 0
        500 http://uk.archive.ubuntu.com gutsy/multiverse Packages