Just for information, I have retried the test with a Xenial 16.04.1
(instead of 16.04) in a fresh install of a VM and the problem still
exists.

Regards.

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https://bugs.launchpad.net/bugs/1579969

Title:
  Xenial: impossible to rename an interface with a .link file

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  Impossible to rename an interface with a .link file in a updated
  Ubuntu Xenial. It's a fresh and basic install without GUI, just a ssh
  server (it's a VirtualBox VM).

  Here is my environment:

  -------------------------------------------
  root@xenial-clean:~# lsb_release -a
  No LSB modules are available.
  Distributor ID:       Ubuntu
  Description:  Ubuntu 16.04 LTS
  Release:      16.04
  Codename:     xenial
  -------------------------------------------

  According to the manpage "systemd.link" (example 2), I can rename an
  interface with a .link file like this:

  -------------------------------------------
  root@xenial-clean:~# ll /etc/systemd/network/10-eth0.link 
  -rw-r--r-- 1 root root 57 May 10 02:07 /etc/systemd/network/10-eth0.link

  root@xenial-clean:~# cat /etc/systemd/network/10-eth0.link 
  [Match]
  MACAddress=08:00:27:be:14:c2

  [Link]
  Name=eth0
  -------------------------------------------

  Currently the interface name is enp0s3 because the OS is not yet
  rebooted:

  -------------------------------------------
  root@xenial-clean:~# ip link
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode 
DEFAULT group default qlen 1
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state 
UP mode DEFAULT group default qlen 1000
      link/ether 08:00:27:be:14:c2 brd ff:ff:ff:ff:ff:ff
  -------------------------------------------

  And now I reboot the OS. But, after the reboot, the interface name is
  still enp0s3:

  -------------------------------------------
  root@xenial-clean:~# ip link
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode 
DEFAULT group default qlen 1
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state 
UP mode DEFAULT group default qlen 1000
      link/ether 08:00:27:be:14:c2 brd ff:ff:ff:ff:ff:ff
  -------------------------------------------

  Just for information:

  -------------------------------------------
  root@xenial-clean:~# cat /proc/cmdline
  BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic 
root=UUID=03363c3a-58b5-4398-82a8-6997ec1a00e5 ro quiet splash

  root@xenial-clean:~# apt-cache policy systemd
  systemd:
    Installed: 229-4ubuntu4
    Candidate: 229-4ubuntu4
    Version table:
   *** 229-4ubuntu4 500
          500 http://fr.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status
  -------------------------------------------

  
  Note: the .link file is taken into account _only_ if I set the 
"net.ifnames=0" kernel boot parameter. But, according to the manpage "man 
systemd.link", this is normally not necessary.

  Regards.

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