Are the updates on the update manager all by Ubuntu? What part of the update manager do you have sift through for, to avoid errors in one's system? Thanks.

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    Welcome to AskUbuntu. Because this question probably will be closed , as this one, I answer YES to your query. Except if you have added external and unsupported PPAs , all the updates are from Ubuntu Official repositories and are safe. Not only safe , but important. – NickTux Oct 22 '12 at 11:59

By default, yes, the updates come from the Ubuntu repositories.

When you start layering in PPAs or commercial repos (as tends to happen over time), updates will be pulled from them, if they contain updated packages. The stability of these packages is not controlled by Canonical or Ubuntu.

What you have to "sift through for" completely depends on what you install and how you install it.

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