I'm pretty new to ubuntu, I started using it about a month ago, and ever since I installed it I haven't been able to install updates. When I go to System Settings>details>install updates, it shows me a long list of updates. When I click install updates I get a pop up window that says "Requires installation of untrusted packages - This requires installing packages from unauthenticated sources."
I can click Settings or OK. If I click okay it closes without updating anything, and if I click Setting it brings me to the update settings window but I don't really know what to do there.
I know how to work with the terminal if that's the case, but I'd like to know how to make this Software Updater work the way it's supposed to.