kde-icons-crystal software package provides Crystal icon theme for KDE, 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 kde-icons-crystal
kde-icons-crystal is installed in your system.
Make ensure the kde-icons-crystal package were installed using the commands given below,
$ sudo dpkg-query -l | grep kde-icons-crystal *
You will get with kde-icons-crystal package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | KDE |
| Package | kde-icons-crystal |
| Version | 3.7-3 |
| Description | Crystal icon theme for KDE |
| Sub Section | KDE |