Linux libertine is no longer in development pivot to libertinus-font

[F0xedb]

development of Libertine seems to have halted, despite outstanding bugs.
Users are advised to upgrade to the de facto successor,
[community]/libertinus-font, and to update any documents and configuration
if necessary.
For compatibility's sake, Linux Libertine will remain in the repos until 2022.
Please refer to https://wikipedia.org/wiki/Linux_Libertine#Derivative_works
for more information.