[Bug 1420974] [NEW] Update not working on Ubuntu 12.04LTS

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Update does work any more. I'm unable to update the software packages.
I'm using ubuntu 12.04LTS

Please see printout below

Ign https://private-ppa.launchpad.net precise/main Translation-en              
Ign https://private-ppa.launchpad.net precise/main Translation-en_US           
Ign https://private-ppa.launchpad.net precise/main Translation-en              
Fetched 4,446 kB in 17s (259 kB/s)                                             
Reading package lists... Error!
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 precise Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key <ftpmaster at 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://ppa.launchpad.net precise Release: The following signatures were
invalid: BADSIG E2BD8FEBCC8E38E1 Launchpad PPA for Jolicloud Team

W: A error occurred during the signature verification. The repository is
not updated and the previous index files will be used. GPG error:
http://76.73.4.58 precise Release: The following signatures were
invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key
<ftpmaster at ubuntu.com>

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/Release

W: Failed to fetch http://ppa.launchpad.net/jolicloud-
team/ppa/ubuntu/dists/precise/Release

W: Failed to fetch http://76.73.4.58/ubuntu/dists/precise/Release

W: Some index files failed to download. They have been ignored, or old ones used instead.
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/76.73.4.58_ubuntu_dists_precise_universe_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.
robert at robert-laptop:~$ 


Please advise on my next steps, also  see screen shot of issue

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: precise
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Update not working on Ubuntu 12.04LTS
https://bugs.launchpad.net/bugs/1420974
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