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W: GPG error: squeeze Release: The following signatures

were invalid: BADSIG AED4B06F473041FA Debian Archive Automatic Signing Key (6.0/squeeze) <ftpmaster@debian.org>

这个GPG erro之前经常遇到。先找到解决方法：

为了解决这个问题，你需要从文件夹/var/lib/apt/lists删除ftp.us.debian.org 文件。

#rm -f /var/lib/apt/lists/ftp.us.debian.org*

#aptitude update