I’ve just had a look at this - unfortunately the parts of the settings app that are needed to set this up on the L5 are not adaptive, and I found them impossible to use. I know that it is possible to do the setting up from the cli instead, but that needs knowledge, and is fiddly on the built-in terminal anyway. (By comparison, the corresponding functionality under Sailfish once you have installed the developer utilities is plug-and-play, I think that Sailfish starts up a DHCP server on connection so the host computer’s USB network address is set up automatically too.)
My advice for a wired connection on the L5 would still be to connect to an ethernet network if possible. Virtually all consumer ISP-supplied routers in their default configuration will have a DHCP server running, and the L5 will get an address on the network without any issues in most cases.