plasma-widget-lancelot software package provides lancelot widget for Plasma, 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 plasma-widget-lancelot
plasma-widget-lancelot is installed in your system.
Make ensure the plasma-widget-lancelot package were installed using the commands given below,
$ sudo dpkg-query -l | grep plasma-widget-lancelot *
You will get with plasma-widget-lancelot package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | KDE |
| Package | plasma-widget-lancelot |
| Version | 4:4.13.0-0ubuntu1 |
| Description | lancelot widget for Plasma |
| Sub Section | KDE |