No DHCP server on the L5
The Librem 5 does use Network Manager, but does not run a DHCP server. The consequence is that devices which are tethering with the L5 through an USB-C cable don't get assigned an IP addr. For a full detailed description of the problem see also the thread in the forum: https://forums.puri.sm/t/usb-tethering-freebsd-laptop-with-l5/21819