The reason seems to be that apt-cacher has a regexp of "index files"
that it revalidates to recognize updates, and the default regexp does
not match "meta-release-development". If you add that, it detects the
new release.

There may be another problem: if the quantal.tar.gz changes during the
developent cycle, apt-cacher will not notice the change, as it assumes
the tar.gz files are versioned packages that are uniquely identified by
their name. That case may be solved if the regexp is changed to also
match ^[a-z]+\.tar\.gz (i.e. tars without any version number). Does that
file change during it's lifetime?

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https://bugs.launchpad.net/bugs/294139

Title:
  update-manager fail release upgrade if using apt-cacher

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