[Bug 313680] Re: apt should install packages whilst downloading.

[Robie Basak]

This bug tracks installation of packages that can be installed while
downloading of other packages is still in progress. I have been working
on the apt source recently and based on apt's internal architecture I
think it is very unlikely that this will ever happen given how much work
it would take.

Functionality to have parallel downloads from the same host is much
easier though, and is tracked in bug 275994.

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https://bugs.launchpad.net/bugs/313680

Title:
  apt should install packages whilst downloading.

Status in “apt” package in Ubuntu:
  Confirmed

Bug description:
  Installation of programs is often a three step process:

   1) Dependencies are calculated - a list of required packages is generated with all requirements that are already met excluded.
   2) Required packages are downloaded from the appropriate repository.
   3) Packages are installed in the required order.

  Large applications may require a significant amount of time to
  complete steps (2) and (3), leading to unnecessarily long install
  times.

  These two steps can be performed in parallel - downloading packages in
  the required install order and installing each as the download
  completes.  This suggested change would require a modified interface,
  most probably a split-screen with, for example, the top half showing
  download progress and the lower half showing install progress for the
  current package.

  Also proposed on Brainstorm: http://brainstorm.ubuntu.com/idea/1931/

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