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When I try getting the updates I get this error:

Reading package lists... Error!
W: GPG error: http://extras.ubuntu.com precise Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key <ftpmaster@ubuntu.com>
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.

What should I do about it?

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The fix for this is to download the failed key again. Try this command:

sudo apt-key adv --keyserver ke16126D3A3E5C1192yserver.ubuntu.com --recv-keys <keymumber>

Note that you need to replace with the keynumber next to BADSIG from your error.

In this case W: GPG error: http://extras.ubuntu.com precise Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key <ftpmaster@ubuntu.com>

it's 16126D3A3E5C1192

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The key for the Ubuntu Extras repositories is in the package ubuntu-extras-keyring, which is apparently not installed on your system; install it.

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