Apt ignored few packages on executing 'sudo apt-get update'

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.

Yes, I meant exactly that.

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1043853

In that case, it's not a bug, but a feature.

For the record: "Ign" really states for "Ignore", the mentioned file couldn't be downloaded, but APT used an alternative to satisfy its needs, so it ignores the failure (Ubuntu doesn't support InRelease yet, just plans to do it while Debian has it for some branches already, so APT uses the "old" files Release and Release.gpg instead if InRelease isn't available).

If a file wasn't modified it says "Hit", if it downloaded "Get" is in front and if a file couldn't be downloaded and nothing can be done about that "Err" which stands for "Error" and is accompanied by an error message and a non-zero exit-code.

Closed as the bugreporter confirmed that this is not a bug but a misunderstanding.

Thanks for the info.