[Bug 438870] Re: Downloads should start when the previous one ends

[Sebastian Heinlein]

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

Status in “aptdaemon” package in Ubuntu:
  Confirmed
Status in “software-center” package in Ubuntu:
  Confirmed

Bug description:
  I was installing a few programs at once. When one of the programs was finished downloading it continued on to install the program. When that program finished it went on to download and install the next one and then went on to the next one after that.
  It would save a lot of time if when the program is installing to start the download of the next.

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