I install Openlp via the terminal with after adding the repository as recommended but the application kept crashing each time I open it. I reinstalled severally and that didn't work either.
This time around I downloaded the latest Openlp 3.0 version from https://get.openlp.org/2.9.4/ and the gave the .deb package and executable permission. And the on the terminal and run
$ sudo apt-get install ./openlp_2.9.4-1_all.deb
That was it.