@doniks
I specifically written "maintained" not created.
The goal of canonical was a hard hill to climb and yes, LibreOffice worked but with evolution of Lomiri maintaining the same goal became too difficult.
So Libertine is still here, works fine for CLI but the GUI part is hit and miss and no effort AFAIK is made to improve it at the moment.
As always, UBports is a very small foundation and such difficult and labor intensive task is not the priority while keeping the OS up-to-date and focus on native apps is the way to better the UX.