Install Nitro Task Manager in Ubuntu/Linux Mint

Install Nitro Task Manager in Ubuntu 12.10 Quantal/Ubuntu 12.04/Ubuntu 11.10/Linux Mint 13/12

Nitro is the best way to get things done. It's simple, fast and powerful at the same time. Nitro also syncs with Dropbox or Ubuntu One. Due to the power of Nitro, you'll never get a "conflicted copy".
Nitro is totally free and open source under the BSD License.

Nitro can sync your tasks with Dropbox or Ubuntu One.

Features:

• Use smart lists to organize your tasks with ease.
• Nitro can sync your tasks with Dropbox or Ubuntu One. Magically.
• Set due dates for your tasks and smart lists will sort them automatically.
• Easily create reminders for tasks that occur on a daily, weekly or monthly basis.
• Instantly search through notes and tasks with Nitro's ultra fast search.
• A range of themes are included and you can even choose a custom background.

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

Terminal Commands:
sudo add-apt-repository ppa:cooperjona/nitrotasks
sudo apt-get update
sudo apt-get install nitrotasks

That's it

Source: Nitro Tasks