How to install .deb in /compat/ubuntu linuxulator

[Thiago Luiz Parolin]

I used linux-browser-installer to get netflix on my freebsd 13, and
everything works fine.
Now I need to access internet banking which only works if I install a
component on the system that is only available for windows/mac/linux. I
would like to use the .deb package from the linux version to install this
software, which is not available for freebsd and there is no access to the
source code.
How to proceed?