how to disable ALT key as a "special" binding in 18.04 so ALT key shortcuts works elsewhere like Libreoffice

Question

I find the single key capture of ALT key very annoying as it interferes with keyboard shortcuts in other applications. E.g., Libreroffice Writer. There are many references to ALT key related issues, but I found no resolution for disabling it in Ubuntu 18.04. My goal is to be able to use ALT in keyboard shortcut combinations and have them actually work.