I need a ppa from launchpad , how to install??
I need a build deb , for armhf
but need a ppa code to install via terminal
We do not provide any PPAs. As Armbian is based on Debian, you should be able to just use their official packages for libopenmpt and related packages (see e.g. https://packages.debian.org/source/sid/libopenmpt). If the version included in your Armbian/Debian version is too old, you will have to compile it yourself.