This bug was fixed in the package systemd - 229-4ubuntu11

---------------
systemd (229-4ubuntu11) xenial; urgency=medium

  * 73-usb-net-by-mac.rules: Split kernel command line import line.
    Reportedly this makes the rule actually work on some platforms. Thanks
    Alp Toker! (LP: #1593379)
  * fsckd: Do not exit on idle timeout if there are still clients connected
    (Closes: #788050, LP: #1547844)
  * libnss-*.prerm: Remove possible [key=value] options from NSS modules as
    well. (LP: #1625584)
  * Backport networkd 231. Compared to 229 this has a lot of fixes, some of
    which we need for good netplan support. Backporting them individually
    would be a lot more work and a lot less robust, and we did not use/support
    networkd in 16.04 so far. Drop the other network related patches as they
    are included in this backport now. (LP: #1627641)
  * debian/tests/networkd: Re-enable the the DHCPv6 tests. The DHCPv6
    behaviour is fixed with the above backport now.
  * pid1: process zero-length notification messages again. Just remove the
    assertion, the "n" value was not used anyway. This fixes a local DoS due
    to unprocessed/unclosed fds which got introduced by the previous fix.
    (LP: #1628687)
  * pid1: Robustify manager_dispatch_notify_fd(). If
    manager_dispatch_notify_fd() fails and returns an error then the handling
    of service notifications will be disabled entirely leading to a
    compromised system. (side issue of LP: #1628687)

 -- Martin Pitt <martin.p...@ubuntu.com>  Tue, 04 Oct 2016 21:43:04
+0200

** Changed in: systemd (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1593379

Title:
  systemd 229-4ubuntu6 ignores net.ifnames=0 on USB or
  /etc/udev/rules.d/80-net-setup-link.rules being a /dev/null symlink

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Released
Status in systemd package in Debian:
  Fix Released

Bug description:
  Description:    Ubuntu 16.04 LTS
  Release:        16.04

  The upgrade to systemd/udev 229-4ubuntu6 breaks net.ifnames=0 for USB
  devices.

  It appears the regression is here:
  * Set MAC based name for USB network interfaces only for universally
      administered (i. e. stable) MACs, not for locally administered (i. e.
      randomly generated) ones. Drop /lib/systemd/network/90-mac-for-usb.link
      (as link files don't currently support globs for MACAddress=) and replace
      with an udev rule in /lib/udev/rules.d/73-special-net-names.rules.
      (Closes: #812575, LP: #1574483)

  As Raspberry Pi's use eth0 via USB, this breaks running systems.

  Before:
  ii  systemd        229-4ubuntu4 armhf        system and service manager
  ii  udev           229-4ubuntu4 armhf        /dev/ and hotplug management daem

  3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP 
mode DEFAULT group default qlen 1000
      link/ether b8:27:eb:16:39:e9 brd ff:ff:ff:ff:ff:ff

  After:

  ii  systemd                      229-4ubuntu6        armhf               
system and service manager
  ii  udev                         229-4ubuntu6        armhf               
/dev/ and hotplug management daemon

  3: enxb827eb1639e9: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc 
pfifo_fast state UP mode DEFAULT group default qlen 1000
      link/ether b8:27:eb:16:39:e9 brd ff:ff:ff:ff:ff:ff

  cat /proc/cmdline
  dma.dmachans=0x7f35 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 
bcm2709.boardrev=0xa01041 bcm2709.serial=0x37b38253 
smsc95xx.macaddr=B8:27:EB:B3:82:53 bcm2708_fb.fbswap=1 bcm2709.disk_led_gpio=47 
bcm2709.disk_led_active_low=0 sdhci-bcm2708.emmc_clock_freq=250000000 
vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000  net.ifnames=0 
dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 
rootfstype=ext4 elevator=deadline rootwait

  With the default interfaces configuration, all networking is lost on
  reboot after upgrade.

  
  SRU TEST CASE
  =============
   * Boot with "net.ifnames=0" on the kernel command line, and connect an USB 
ethernet device. It will still be called enxDEADBEEF with current xenial. With 
the -proposed version it will instead keep the kernel name, like "usb0" as 
intended.

   * Do "sudo ln -s /dev/null /etc/udev/rules.d/80-net-setup-link.rules"
  (the other documented way to disable ifnames) and do the above
  connect/name check test again.

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