gpick software package provides advanced GTK+ color picker, 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 gpick
gpick is installed in your system.
Make ensure the gpick package were installed using the commands given below,
$ sudo dpkg-query -l | grep gpick *
You will get with gpick package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Graphics |
| Package | gpick |
| Version | 0.2.4-1 |
| Description | advanced GTK+ color picker |
| Sub Section | Graphics |