F-Droid
Install Attc Code from F-Droid.
Add the signed Attc Code repository to the F-Droid client once. After that, Attc Code installs and updates like any other F-Droid app.
1. Add the repository
Open this page on the phone where F-Droid is installed, then tap the button below. If your F-Droid client does not open the link, add the HTTPS address manually under Settings → Repositories → Add repository.
Open in F-Droidhttps://attc-config-technician.github.io/Attc-Code/fdroid/repo
Or scan this code with the F-Droid repository scanner:

2. Install Attc Code
- Let F-Droid refresh the new repository.
- Search for Attc Code in F-Droid.
- Open the listing and tap Install. F-Droid verifies the APK signature against the release key.
Updates are delivered through F-Droid. The app signing key does not change, so your Ubuntu environment and sessions are preserved.
Repository fingerprint
F-Droid shows this fingerprint when you add the repository. Compare it before trusting the repo:
AB:73:93:41:CA:B4:66:C0:0C:99:3C:46:ED:E7:15:6E:63:3F:1C:B7:05:FD:FD:7C:C2:26:6E:95:F2:5E:60:B5
Prefer a direct APK?
You can still download the latest signed APK from GitHub Releases. F-Droid is the recommended path because it handles updates.