Public bug reported:

Binary package hint: update-manager

whenever I check for updates I get this msg:
[START msg]
W: A error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://extras.ubuntu.com maverick Release: The following signatures were 
invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key 
<ftpmas...@ubuntu.com>

W: GPG error: http://ppa.launchpad.net maverick Release: The following 
signatures were invalid: BADSIG 5A16033A9A6FE242 Launchpad ppa
W: GPG error: http://eg.archive.ubuntu.com maverick Release: The following 
signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic 
Signing Key <ftpmas...@ubuntu.com>
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/maverick/Release  

W: Failed to fetch http://ppa.launchpad.net/lernid-devs/lernid-
releases/ubuntu/dists/maverick/main/source/Sources.gz  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/lernid-devs/lernid-
releases/ubuntu/dists/maverick/main/binary-i386/Packages.gz  404  Not
Found

W: Some index files failed to download, they have been ignored, or old ones 
used instead.
[END msg]
and when I try to install some thing from Synaptic Package Manager, it list 
some unauthorised packages that related to this installation, anyway, this all 
started just a couple of days ago, and I was using the same internet connection 
before.
please help, thanks.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/723517

Title:
  signature problem

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