Estranho. Ao tentar instalar (ou reinstalar, sei lá) a versão 3.16.7 do hplip, vem a seguinte mensagem:
note: Defaults for each question are maked with a '*'. Press <enter> to accept the default.
/Gtk-Message: 11:57:45.718: Failed to load module "canberra-gtk-module"
-Gtk-Message: 11:57:45.764: Failed to load module "canberra-gtk-module"
error: ubuntu-18.04 version is not supported, so all dependencies may not be installed. However trying to install using ubuntu-16.04 version packages.
O site developers.hp.com garante as compatibilidades:
Ubuntu (12.04, 14.04, 15.10, 16.04, 16.10, 17.04,17.10,18.04,18.10,19.04,19.10)