Ubuntu dark mode

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Solution for Ubuntu 24.04 LTS: Enabling Dark Mode via Environment Variable

If you’re experiencing theme issues on Ubuntu 24.04 LTS, you can resolve it by editing the /etc/environment file:

1. Open the file in a text editor with root privileges:

   sudo nano /etc/environment
   

2. Add the following line at the end of the file:

   ADW_DEBUG_COLOR_SCHEME=prefer-dark
   

3. Save the changes and reboot your system.

Note:
This tweak affects how GNOME’s libadwaita handles your application’s appearance. libadwaita is responsible for enforcing UI styling, including theme preferences.