I tried recreating this by upgrading an Ubuntu 18.10 system to Ubuntu 19.04 and the dialog I received, in English, indicated that it was in fact upgrading to Ubuntu 19.04. Subsequently I suspect this is a translations issue.
I tried recreating this by upgrading an Ubuntu 18.10 system to Ubuntu 19.04 and the dialog I received, in English, indicated that it was in fact upgrading to Ubuntu 19.04. Subsequently I suspect this is a translations issue.