Hi, to workaround the issue you can add the dependency libicu76 (which is installed on Ubuntu 25.04) to the DEB file :
- Extract the duplicati deb file in a folder duplicati with the command dpkg-deb --raw-extract duplicati-2.1.0.5_stable_2025-03-04-linux-x64-gui.deb duplicati
- Modify the file duplicati/DEBIAN/control by adding "| libicu76 " in the line “Depends:”
- Create a new DEB file with the command dpkg-deb --build duplicati
- Install the new DEB file with the command sudo apt install ./duplicati.deb