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[Kiwinote <kiwinote@xxxxxxxxx>]

This has been broken for quite a while - there are two parts to this:

--> UNITY_LENS_APPLICATIONS
Unity-lens-applications reads a Berkeley DB file which is generated by software-center. The filename contains the version number of libdb. In February 2012 the transition [0] to libdb5.1 was done, in November 2013 there was a transition [1] to libdb5.3, but the filename was not updated, which means that since then the source code of unity-lens-applications had had a wrong filename in line 42 of src/unity-ratings-db.c [2].

[0] http://bazaar.launchpad.net/~unity-team/unity-lens-applications/trunk/revision/17.1.166
[1] http://bazaar.launchpad.net/~unity-team/unity-lens-applications/trunk/revision/375
[2] http://bazaar.launchpad.net/~unity-team/unity-lens-applications/trunk/view/head:/src/unity-ratings-db.c

--> SOFTWARE_CENTER
Upon launching software-center, software-center generates a file for unity-lens-applications to read. For at least a year, if not multiple years, software-center crashes whilst trying to generate this db. The crash occurs in line 336 of [3] with "DBInvalidArgError: (22, 'Invalid argument -- BDB0054 illegal flag combination specified to DB_ENV->open')". Experimentation seems to show that removing the "|bdb.DB_NOMMAP" stops this crash. The NOMMAP flag was introduced in [4], but I don't know enough about the Berkeley DB format to know why the NOMMAP flag should or shouldn't be in use. The internet seems to describe the flag as "Always copy read-only database files in this environment into the local cache instead of potentially mapping them into process memory". I couldn't pull up any other illegal flag combinations using NOMMAP errors besides software-center.

[3] http://bazaar.launchpad.net/~ubuntuone-control-tower/software-center/trunk/view/2869/softwarecenter/backend/reviews/__init__.py
[4] http://bazaar.launchpad.net/~ubuntuone-control-tower/software-center/trunk/revision/2434

After installing a modified version of unity-lens-applications and
changing software-center and launching software-center I needed to kill
the unity-scope-loader process after which the ratings reappeared in the
dash (obviously only for apps which have ratings, which are not the
newest ones).

Another issue affecting the applications lens is the missing
applications descriptions due to bug #1486061

-- 
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Touch seeded packages, which is subscribed to unity in Ubuntu.
https://bugs.launchpad.net/bugs/1396553

Title:
  No rating and 0 reviews shown for all applications in the dash

Status in Unity:
  Triaged
Status in unity package in Ubuntu:
  Triaged

Bug description:
  When viewing the preview of any application in the dash (installed or not) by right-clicking it, the displayed number of reviews is always 0 (zero) and the rating is always empty.
  This used to work in previous Ubuntu versions.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.3+14.04.20140826-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
  Uname: Linux 3.13.0-40-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CurrentDesktop: Unity
  Date: Wed Nov 26 11:08:57 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-10-13 (43 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)

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