Hi,
With the previous version, I could install new fonts by copying the *.ttf files into /usr/share/fonts/truetype and restarting Libre Office.
But with Libre Office 6.0.1 this doesn’t work anymore. I also tried to put a copy into /usr/share/fonts and rebooting the PC, to no avail.
I am running Kubuntu 17.10.
All ideas welcome.