Wappler on Ubuntu 19.04

I tried both the stable and the beta of Wappler.
Upon installing, this warning which causes issues when running Wappler:
pkg: dependency problems prevent configuration of wappler:
wappler depends on libgconf2-4; however:
Package libgconf2-4 is not installed.
wappler depends on lftp; however:
Package lftp is not installed.
The following packages have unmet dependencies:
wappler : Depends: libgconf2-4 but it is not installable
E: Unmet dependencies. Try ‘apt --fix-broken install’ with no packages (or specify a solution).

Please advise