qtdeclarative5-ubuntu-thumbnai software package provides QML interface for the thumbnailer., you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install qtdeclarative5-ubuntu-thumbnai
qtdeclarative5-ubuntu-thumbnai is installed in your system.
Make ensure the qtdeclarative5-ubuntu-thumbnai package were installed using the commands given below,
$ sudo dpkg-query -l | grep qtdeclarative5-ubuntu-thumbnai*
You will get with qtdeclarative5-ubuntu-thumbnai package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Library development |
| Package | qtdeclarative5-ubuntu-thumbnai |
| Version | 1.1+14.04.20140401.1-0ubuntu1 |
| Description | QML interface for the thumbnailer. |
| Sub Section | libdevel |