acpitool software package provides command line ACPI client, 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 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 14 04 lts trusty tahr |
| Section | Utilities |
| Package | acpitool |
| Version | 0.5.1-3 |
| Description | command line ACPI client |
| Sub Section | Utils |