plasma-widget-smooth-tasks software package provides alternate task manager plasma widget, 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-smooth-tasks
plasma-widget-smooth-tasks is installed in your system.
Make ensure the plasma-widget-smooth-tasks package were installed using the commands given below,
$ sudo dpkg-query -l | grep plasma-widget-smooth-tasks *
You will get with plasma-widget-smooth-tasks package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | KDE |
| Package | plasma-widget-smooth-tasks |
| Version | 1flupp0~hg20120610-2build2 |
| Description | alternate task manager plasma widget |
| Sub Section | KDE |