Software Updater issue in Ubuntu


I use Ubuntu 14.04 Desktop Edition. I installed Unity Tweak Tool. Now I see Software Updater's message that it must be updated.
It's all nice, BUT... Then I get a message that it requires installation of untrusted packages from unauthenticated sources.
What's going on here?
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David1978Author Commented:
It gets stranger by the minute. I'd initiated Software Updater, but it just found "Ubuntu base" updates and successfully installed them.
No mention of Unity Tweak tool. See, before that I didn't initiate the update. It'd started by itself. So... I don't know.
look in /etc/repos.d
When you installed the unity UI, it may have added additional repositories that are "unauthenticated" by ubuntu. did you run any command that "authenticated" by adding the new repos certificate to the repository/key chain to make it trusted?

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David1978Author Commented:
Hello and thanks for your reply!

I actually didn't install Unity. It came with the OS when I first installed it. And I didn't do what you're asking (frankly, I have no idea what you're talking about).
O.K. I ran again today Software Updater, it still doesn't say anything about the Unity Tweak Tool.
I'll grant you points for now and if and when the issue arises anew, I'll come back here for an answer.
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