You don't want a fix but a new feature. apt is completely transaction
unaware - so this must be implemented in a level above apt (aptdaemon).

But is it really worth the effort? How much time would we really safe?
It only makes sense to start the next download during the installation
phase of the currently running transaction. Downloading packages from
more than one transaction at the same time doesn't make any sense, since
both would be slowed down. How long does it take to actually install a
package after it has been downloaded? 5 or 10 seconds?

We don't need to care about inter-dependencies between transactions. We
just try to download what we can get/guess. If we missed a new
dependency since a previous transaction was cancelled, we will just
download the missing packages during the normal processing of the
transaction.

Mvo, purchases use chained transactions? We would skip downloads of
chained transactions.

Mpt, how to handle progress information? This could result in a
backwards running progress if we identify more packages to download.

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https://bugs.launchpad.net/bugs/438870

Title:
  Downloads should start when the previous one ends

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