Install Synapse launcher in Ubuntu/Linux Mint

Install Synapse launcher in Ubuntu 12.04/11.10/11.04/10.10/10.04/Linux Mint 13/12/11/10/9

Synapse is a semantic launcher written in Vala that you can use to start applications as well as find and access relevant documents and files by making use of the Zeitgeist engine.

Features:

• Applications – searches your desktop files
• Banshee – allows you to play/enqueue music files in Banshee
• Commands – runs any command (ie. “sudo apt-get update”)
• Devhelp – search documentation using Devhelp
• Dictionary – find definitions of words
• Directory search – allows opening of commonly used directories
• Gnome session – log out, shut down, restart
• Hybrid search – complete Zeitgeist results by searching for similar files
• Rhytmbox – play/enqueue music files in Rhythmbox
• UPower – suspend & hibernate your computer
• Zeitgeist – search anything logged by Zeitgeist

To install Synapse in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

Terminal Commands:
sudo add-apt-repository ppa:synapse-core/ppa
sudo apt-get update
sudo apt-get install synapse

After installation go to menu and open Synapse. Go to preferences and check "Startup on Login". To activate synapse Press Ctrl+Space.
That's it

Source: Synapse