What does this script do?

This is an automatic theme switcher for Ubuntu 22.04 and 24.04.

It sets the light-theme at sunrise and automatically switches to the dark-theme at sunset. It also sets the prefer-light/prefer-dark value to indicate to programs and websites which version you prefer.

Installation

1. Open the auto-darkmode-switcher.sh script with a text-editor and add your latitude, longitude and preferred themes.
2. Execute the install script once: sh ./install.sh.
3. If it complains about dependencies, install them and execute it again.

Troubleshooting

Execute systemctl --user list-timers. If all went well, there should be a "auto-darkmode-switcher.time"-unit in the list. Exit by pressing Q.

How to stop the script

Execute systemctl --user stop auto-darkmode-switcher.timer.

Follow the install-instructions if you want to start it again.