Unable to fix broken Adobe Flash installation

[indiapavan]

I just installed Ubuntu 9.04 again on my PC after a long time. Everything was working fine. No problems at all. After running all the necessary updates, I wanted to install Adobe Flash. This I did by going to Adobe's site (http://get.adobe.com/flashplayer/). I selected the APT version for 9.04+. It was installing fine UNTIL there was a power cut. Since then I have been trying out various methods of repair suggested in these forums. But again and again I get the same message:


W: GPG error: http://archive.canonical.com jaunty Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: You may want to run apt-get update to correct these problems


Please somebody help me if possible. Thanks in advance.

[shaohu.xie]

You try follow command please

1. $ cd /var/lib/apt/lists/partial
2. $ sudo rm -rf *
3. Restore sources.list file to default status.
4. $ sudo apt-get update -o Acquire::http::No-Cache=true
5. $ sudo apt-get update