qtdeclarative5-ubuntu-ui-extra software package provides Ubuntu web browser QML plugin, 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-ui-extra
qtdeclarative5-ubuntu-ui-extra is installed in your system.
Make ensure the qtdeclarative5-ubuntu-ui-extra package were installed using the commands given below,
$ sudo dpkg-query -l | grep qtdeclarative5-ubuntu-ui-extra*
You will get with qtdeclarative5-ubuntu-ui-extra package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | X Window System software |
| Package | qtdeclarative5-ubuntu-ui-extra |
| Version | 0.23+14.04.20140414-0ubuntu1 |
| Description | Ubuntu web browser QML plugin |
| Sub Section | x11 |