do-release-upgrade doesn't show which files are currently downloaded and will be downloaded

[Karl-Philipp Richter]

Rather than forcing the user to review the list of pages to be updated and downloaded for a release upgrade (very few people will review the list and a lot will simply proceed) it be nice to show this list during the download of packages (both already downloaded and to be downloaded packages) with their size. This allows the user to view the list during the time consuming download and eventually abort the release upgrade if she_he spots some large unnecessary downloads.

Imagine you are getting impatient for the download to finish and check what's taking so long and then spot all these `texlive` packages, but only installed it to test if you like LaTeX and never bothered to remove it. Then it'd be nice to abort the release upgrade, remove texlive and restart it (where downloads would be resumed due to `apt-get`'s capabilities of reusing and resuming downloads from cache).

ProblemType: BugDistroRelease: Ubuntu 15.04
Package: ubuntu-release-upgrader-core 1:15.04.14.3
Uname: Linux 4.2.2-040202-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1.6
Architecture: amd64
CrashDB: ubuntu
Date: Fri Oct 23 11:13:43 2015
InstallationDate: Installed on 2015-09-14 (38 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MarkForUpload: True
PackageArchitecture: allSourcePackage: ubuntu-release-upgrader
SystemImageInfo:
 current build number: 0
 device name:
 channel: daily
 last update: Unknown
UpgradeStatus: Upgraded to vivid on 2015-10-23 (0 days ago)
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

I think the "Do you want to upgrade?" dialog box covers this as it includes details about packages to "Install", "Remove", and "Upgrade".

[Karl-Philipp Richter (krichter722)]

> I think the "Do you want to upgrade?" dialog box covers this as it includes details about packages to "Install", "Remove", and "Upgrade".
Yes, and my point is that the list isn't visible after the upgrade has been started during the download.