Timer is a free and open source countdown timer application for Linux. It is a simple and easy to use app. It comes with timer notification, manual timer stopping, dark team support, set the spinner size, action after finished timing like reboot and shutdown and resizable window. It is written in Python and released under GNU General Public License v3.0.
How to Install Timer app on Ubuntu Linux
Timer is available as a flatpak package file from the remote flathub repository. If you don’t have then first install flatpak and flathub on your system . And restart your system after the flatpak installation.
Now open the terminal app (ctrl+alt+t) and run below Timer countdown timer application.
flatpak install flathub com.github.vikdevelop.timer
It will install the latest Timer app on your system. And run this below command to open Timer app.
flatpak run com.github.vikdevelop.timer
And uninstall Timer using
sudo flatpak uninstall com.github.vikdevelop.timer