indicator-messages-gtk2 software package provides indicator that collects messages that need a response, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install indicator-messages-gtk2
indicator-messages-gtk2 is installed in your system.
Make ensure the indicator-messages-gtk2 package were installed using the commands given below,
$ sudo dpkg-query -l | grep indicator-messages-gtk2 *
You will get with indicator-messages-gtk2 package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | GNOME |
| Package | indicator-messages-gtk2 |
| Version | 0.6.0-0ubuntu1 |
| Description | indicator that collects messages that need a response |
| Sub Section | GNOME |