Comment 2 for bug 1043853

Do you mean entries like so:
Ign http://security.ubuntu.com quantal-security InRelease
?

In that case, it's normal. Apt checked the headers and the file has not been modified on the mirror (no changes to the file) hence it used the previously downloaded one instead. This is an optimisation to prevent re-downloading the same thing over and over and over again.

Or do you mean something else? In that case please explain what you mean.

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Also ubiquity is not the right package to report a problem about apt. Please report problems against correct package, which in this case is apt.