I have ran into this as well where we have a router plugged into a juniper switch, the router loads faster then the juniper so at the moment the router comes up all the interfaces are down, then the switch comes up.

Tried rc10 with rufus, same problem works in win32diskimager though.

I suspect this is the same issue as T1080. if the destination ip of the l2tpv3 tunnel is unreachable(no default route) it wont load. I suspect its loading the l2tpv3 config before DHCP has installed a default route. My workaround is to install a very low metric static default route, that will get overwritten by OSPF(in my case).

@UnicornNL, Used rufus, and unetbootin from windows 10