The new Ubuntu deb package identifies as version and does thus not let you upgrade if you already run 4.6-6. This is what apt show for the newly downloaded package: sudo apt show ./ToneLib-GFX-amd64.deb Package: tonelib-gfx Version: 4.6-6 Priority: optional Section: sound Maintainer: Tonelib team <feedback@tonelib.net> Installed-Size: 65,9 MB Depends: libasound2 (>> 1.0.22), libc6 (>= 2.11), libcurl3-gnutls (>= 7.16.2-1), libfreetype6 (>= 2.2.1), libgcc1 (>= 1:4.1.1), libgl1-mesa-glx (>= 18.0.5), libstdc++6 (>= 4.6), libx11-6 (>= 0), libxext6 (>= 0), libxinerama1 (>= 0) Homepage: https://tonelib.net/gfx-overview/ Download-Size: 40,8 MB .....