acpitool software package provides command line ACPI client, 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 acpitool
acpitool is installed in your system.
Make ensure the acpitool package were installed using the commands given below,
$ sudo dpkg-query -l | grep acpitool *
You will get with acpitool package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Utilities |
| Package | acpitool |
| Version | 0.5.1-3 |
| Description | command line ACPI client |
| Sub Section | Utils |