Hi there! I understand you're having trouble logging into the Donatos Pizza app on your Linux device. Let's get this sorted out together. Could you please tell me a bit more about what's happening when you try to log in? For example, do you see any error messages, does the app freeze, or does it just not respond?

In the meantime, here are a few straightforward steps you can try:

1. Restart the app: Close the app completely and reopen it to see if the issue persists.

2. Use "Continue as Guest" method: Some users have found success by first choosing the "Continue as Guest" option, then attempting to sign in from that screen.

3. Check your internet connection: Make sure your Linux device is properly connected to the internet, as login requires a stable connection.

4. Clear app cache and data: If possible on your Linux platform (depending on how you run the app), clearing cached data can help. This might involve deleting the app's config or cache folders.

5. Update the app: Ensure the app is updated to the latest version available for your platform.

Since you're using Linux, can you share how you are running the Donatos app? For example, are you using a web browser or an Android emulator?

If these steps don’t work, I can guide you through more in-depth solutions or help get in touch with Donatos support.

Are you satisfied with this initial guidance? Let me know any additional info so I can help further!