[Bug 1371942] Re: "this requires installation of untrusted packages": incomplete warning, then "OK" button does nothing

[Humphrey van Polanen Petel]

Update manager installs a range of items and concludes and immediately
update manager pops up with another install, this time for a small item
for "ubuntu base".  I accept, it asks for my password which I enter and
then a panel pops up saying "this requires installation of untrusted
packages" (which is the same as what started this bug report.

Note that at that moment the mouse clicks are not effective (a separate
bug, it seems to me).

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https://bugs.launchpad.net/bugs/1371942

Title:
  "this requires installation of untrusted packages": incomplete
  warning, then "OK" button does nothing

Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  I run UpdateManager, I click on "Install updates" and I get this error
  message (see screenshot):

  "This requires installing packages from unauthenticated sources"

  I'm SICK of Update Manager's vague error messages that don't provide the most basic information.
  WHAT requires installing WHICH packages from WHICH unauthenticated sources, and WHY?

  Also, I'm presented with a "Settings" button and an "OK" button.
  To me "OK" means "Ok, proceed, I'm happy with it, do the install".
  Not. Turns out it means "Ok, so forget about it, do  nothing".

  The button should be disambiguated. Actually there should be two options (besides "Settings"):
  - proceed at your own risk
  - cancel (or abort, or whatever)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: update-manager 1:0.196.12
  ProcVersionSignature: Ubuntu 3.13.0-34.60-generic 3.13.11.4
  Uname: Linux 3.13.0-34-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Sep 20 18:09:24 2014
  GsettingsChanges:
   b'com.ubuntu.update-manager' b'show-details' b'true'
   b'com.ubuntu.update-manager' b'window-height' b'748'
   b'com.ubuntu.update-manager' b'first-run' b'false'
   b'com.ubuntu.update-manager' b'window-width' b'677'
   b'com.ubuntu.update-manager' b'launch-time' b'1411206597'
  InstallationDate: Installed on 2013-10-11 (343 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  PackageArchitecture: all
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to trusty on 2014-05-24 (118 days ago)

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