plasma-widget-mail software package provides a Plasma widget that checks for new mail, 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-mail
plasma-widget-mail is installed in your system.
Make ensure the plasma-widget-mail package were installed using the commands given below,
$ sudo dpkg-query -l | grep plasma-widget-mail *
You will get with plasma-widget-mail package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | KDE |
| Package | plasma-widget-mail |
| Version | 0.3.1-0ubuntu7 |
| Description | a Plasma widget that checks for new mail |
| Sub Section | KDE |