Ah, so there is net.ifnames=0 in the kernel command line. So this has identical symptoms to bug 1593379. Can you please try to change /lib/udev/rules.d/73-usb-net-by-mac.rules like in https://anonscm.debian.org/cgit/pkg-systemd/systemd.git/commit/?h =ubuntu-xenial&id=f79508898, i. e. split the IMPORT{cmdline} line into two?
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