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[Launchpad Bug Tracker <1593379@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 230-5

---------------
systemd (230-5) unstable; urgency=medium

  [ Martin Pitt ]
  * Sync test/networkd-test.py with current upstream master, and remove our
    debian/tests/networkd copy. Directly run test/networkd-test.py in
    autopkgtest.
  * debian/extra/rules/73-usb-net-by-mac.rules: Disable when
    /etc/udev/rules.d/80-net-setup-link.rules is a symlink to /dev/null, to be
    consistent with the documented way to disable ifnames. (Closes: #824491,
    LP: #1593379)
  * debian/rules: Ignore libcap-ng.so in the "does anything link against /usr"
    check, to work around libaudit1 recently gaining a new dependency against
    that library (#828991). We have no influence on that ourselves. This fixes
    the FTBFS in the meantime.

  [ Felipe Sateler ]
  * Convert common code into a private shared library. This saves about 9 MB
    of installed size in the systemd package, and some more in systemd-*.

 -- Martin Pitt <mpitt@xxxxxxxxxx>  Fri, 01 Jul 2016 09:15:12 +0200

** Changed in: systemd (Ubuntu)
       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:
  In Progress
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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