Update information outdated

Hi! I've had some issues with the update manager. It keeps telling me that the information was updated a few days ago, even after I've installed some updates. I read somewhere that this has to do with the software sources, but I'm really new to Ubuntu and Linux and I don't want to make any changes I can't undo later. I'd like some help on this, please. Thank you!

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Updates

If you click on the "Check" button, this should change. Clicking on "Settings" will allow you to set the frequency that these updates will be checked for.

Updates.

I already did that, several times. I check everyday for updates and when it finds some I install them, but after the installation it still shows that it was updated days ago.
This is pretty much what has happened to me: http://maketecheasier.com/fix-the-package-information-was-last-updated-days-ago-error-in-ubuntu/2012/06/22
 
The way to fix it is there, but I just want to make sure if I should follow those steps or if there's another way to do it. Thank you.

Neat

Interesting. I've never personally run into this, but I'm glad you've found a fix.

Actually, I was checking and

Actually, I was checking and I'm getting a different error I think. I haven't tried what's on that website because what I get when I run sudo apt-get update is a different message, I get the following:

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@ubuntu.com>

W: GPG error: http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG CBDFA02B432BB368 Launchpad PPA for Cinelerra
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG A16A26A00C7A29E2 Launchpad Dick MacInnis
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG A16A26A00C7A29E2 Launchpad Dick MacInnis
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG A16A26A00C7A29E2 Launchpad Dick MacInnis
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG A16A26A00C7A29E2 Launchpad Dick MacInnis
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG 9DA4BD18B9A06DE3 Launchpad PPA for Inkscape Developers
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG 87538FEDDF8063EB Launchpad PPA for KXStudio Team
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures were invalid: BADSIG 40C18E9EC07EE05F Launchpad PPA for Pascal de Bruijn
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/Release

W: Some index files failed to download. They have been ignored, or old ones used instead.

I found a fix here: http://stream-recorder.com/forum/w-gpg-error-http-ppa-launchpad-net-t6741.html?s=8c81b91f9d06a623876dce4065132411&amp; but unfortunately, it didn't work for me.

 

Fix with Y PPA Manager

Ok, Luckily Dream Studio comes with Y PPA Manager, which includes a tool to fix just such errors.
Open Y PPA Manager (Dash->Y PPa Manager), double click on "Advanced", and click on "Try to fix all GPG BADSIG errors". Check for updates as usual and see if that works.

Thank you!

Thanks! That did it! That solved the problem.