[SOLVED]Mintupdate gives consistant error message, no update

[PGG]

Getting these error message and no updates performed

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W: GPG error: http://dl.google.com stable Release: The following signatures were invalid: BADSIG A040830F7FAC5991 Google, Inc. Linux Package Signing Key <linux-packages-keymaster@google.com>
W: GPG error: http://archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>

E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_precise-security_universe_i18n_Translation-en
E: The package lists or status file could not be parsed or opened.
E: _cache->open() failed, please report.

Tried to add gpg key

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sudo su -
add-apt-key A040830F7FAC5991
add-apt-key 40976EAF437D05B5

but does not have any effect.

Here is the listing for inxi -r

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Repos:     Active apt sources in file: /etc/apt/sources.list
           deb http://mirror.optus.net/linuxmint/packages/ maya main upstream import
           deb http://archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse
           deb http://archive.ubuntu.com/ubuntu/ precise-updates main restricted universe multiverse
           deb http://security.ubuntu.com/ubuntu/ precise-security main restricted universe multiverse
           deb http://archive.canonical.com/ubuntu/ precise partner
           deb http://packages.medibuntu.org/ precise free non-free
           Active apt sources in file: /etc/apt/sources.list.d/google-talkplugin.list
           deb http://dl.google.com/linux/talkplugin/deb/ stable main

Any help will be gratefully received, please...

Philip and Donald

Problem has been [SOLVED] using the link as shown below

[remoulder]

See http://www.ubuntugeek.com/how-to-fix-th ... adsig.html

[PGG]

Thanks remoulder

Method One worked.

Woopee...!