On Ubuntu 20.04
pwaify https://daleharvey.github.io/testapp/
--->
./Yay an app with a super long name: error while loading shared libraries: libgconf-2.so.4: cannot open shared object file: No such file or directory
Workaround: sudo apt -y install libgconf-2-4
Still, would be nice if it would not depend on something that might be missing from my Mum's system (metaphorically speaking).