The qBittorrent is a lightweight but featureful BitTorrent client that would be very easy to use, and the the closest open source (GNU GPL v2 license) equivalent to µtorrent.To install qBittorrent on Ubuntu 9.10 Karmic Koala just follow these steps:
1. Open your terminal and type this command:
$sudo add-apt-repository ppa:hydr0g3n/ppa
2. Type the following command sudo gedit /etc/apt/sources.list and add the two lines below:
deb http://ppa.launchpad.net/hydr0g3n/ppa/ubuntu Karmic main
deb-src http://ppa.launchpad.net/hydr0g3n/ppa/ubuntu Karmic main
3. Get this key by doing this:
$sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 47B4D1C4
4. Update your Source.list:
$sudo apt-get update
5. Then install qBittorrent:
$sudo apt-get install qbittorrent
µTorrent for USB 8GB