GNOME Pomodoro: A Time Utility Tool That Increases Productivity
However, despite all that, If it says No Application Found there’s a hack to that. Head over to this link: Tools. Don’t forget to scroll up on the wikipedia page if you want to learn more about Pomodoro.
On TIMER, drag the Pomodoro duration right to increase your work time and vice versa to decrease it. Same applies to duration time too. Tinker around by enabling/disabling to understand why the program works so.