Hi Ray/Julian,

>  * NOTE: The final comment on the upstream GNOME bug claims that the fix
> is incomplete. However, it is possible that the running NetworkManager was
> not restarted (see Regression Potential notes above), which is why
> nm-dhcp-helper is falling back to Event.

This is not the case. Even today, one of the machines is showing the
message from the wrapper that indicates the DHCP lease was not correctly
applied according to the journal:

➜ sjors@cuba  ~  cat /tmp/nm-helper-retries.log 
Tue Nov 14 07:23:07 CET 2017: needed 5 attempts to update NetworkManager 
(RENEW).
Tue Nov 14 09:17:45 CET 2017: needed 5 attempts to update NetworkManager 
(RENEW).
Tue Nov 14 10:06:58 CET 2017: needed 4 attempts to update NetworkManager 
(RENEW).

This is even though the machine was rebooted yesterday, so the daemon
was restarted:

➜ sjors@cuba  ~  uptime                          
 23:12:16 up 1 day, 14:04,  3 users,  load average: 0,59, 0,49, 0,47

And the machine is using the patched version of the network-manager:

➜ sjors@cuba  ~  apt-cache policy network-manager
network-manager:
  Installed: 1.2.6-0ubuntu0.16.04.1screenpoint1
  Candidate: 1.2.6-0ubuntu0.16.04.1screenpoint1
  Version table:
 *** 1.2.6-0ubuntu0.16.04.1screenpoint1 100
        100 /var/lib/dpkg/status
     1.2.6-0ubuntu0.16.04.1 500
        500 http://nl.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages

However, I have not investigated why this happens, as the wrapper script
is an acceptable work-around. I'll report back, however, whether we
still have this problem with the updated Xenial packages -- there is
always a chance I made an error somewhere.

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https://bugs.launchpad.net/bugs/1696415

Title:
  NetworkManager does not update IPv4 address lifetime even though DHCP
  lease was successfully renewed

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