Update not working on Ubuntu 12.04LTS

[roblon2010]

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 <email address hidden>

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 <email address hidden>

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@robert-laptop:~$

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

[Daniel Kessel (dkessel)]

Thanks for reporting this bug! However, I don't think this is a bug in the Ubuntu QA Website, which this bug was files against. I am reassigning this bug to "apt", so someone with knowledge about apt might be able to have a look at it.

Does this problem still happen? It could also have been a temporary issue.

[Brian Murray (brian-murray)]

It looks like the PPA still exists, so you may want to try removing it and readding it.

https://launchpad.net/~jolicloud-team/+archive/ubuntu/ppa?field.series_filter=precise