Why is netplan not working?

Question

linux

Good day, I installed ubuntu 17.10 as a sandbox on virtualbox, installed two NAT network cards and a host adapter, and it seems that in this version netplan should be more convenient than previous versions of the settings, but after configuring the netplan for articles from the Internet, I can’t do it for half a day the interface to run everything on the screenshots will be seen, where am I wrong, tell me ???



if just nat was applied, then when connecting the second one, it writes an error in the line

Answer 1

You obviously have some kind of confusion with tabs