解决ubuntu下 error occurred during the signature verification

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在ubuntu 下想安装一个软件（我使用的是163的源），却被告知 file size mismatch.

于是更新了package list:

sudo apt-get update

...

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://security.ubuntu.com lucid-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://us.archive.ubuntu.com lucid Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://us.archive.ubuntu.com lucid-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>

即使执行：

sudo apt-get clean

sudo apt-get update

还是会有相同的错误。

Google 并查看了文档：

http://ubuntuforums.org/showthread.php?t=1480604

有了解决方案：

sudo apt-get clean

cd /var/lib/apt

sudo mv lists lists.old

sudo mkdir -p lists/partial

sudo apt-get clean

sudo apt-get update

通过这些处理之后再次安装package的时候就没有这个file size mismatch错误了，但还是会有些其他的错误，不知道是不是跟我使用163的源有关。

关于error occurred during the signature verification 的原因，似乎是：

Looks like this old fix still does the trick.

原始的ubuntu bug report:

https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/24061