IPv4 Address Lost 8 Days After Previous DHCP Allocation

[Thomas A. F. Thorne]

My Ubuntu 16.04 desktop frequently loses the IPv4 address on its wired ethernet connection to my office's network. This happened this morning and previously happened 8 days ago.

The network uses a Windows Small Business Server as its main Active Domain Domain Controller which includes a DHCP service. There are several other Ubuntu 16.04 machines on the network that do not seem to experience this issue. This is an IPv4 only network, no IPv6 services are configures and IPv6 is disabled on most machines.

My PC has two wired network ports. One connects to the office network and uses DHCP to get an IPv4 address. The other connects to a switch on my desk that has test equipment connected to it and uses a static IPv4 address.

I have the output from:
 ll /var/lib/NetworkManager
 nmcli -p c
 nmcli -p c show TN\ Wired
Taken; after the renewal of the address eight days ago, this morning before I "Disconnect"ed the connection from the drop down menu and after I reconnected and an IPv4 address was re-acquired. If any of this would be helpful, please let me know and I shall post it.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: network-manager 1.2.2-0ubuntu0.16.04.3
ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35
Uname: Linux 4.4.0-57-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jan 31 09:55:10 2017
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2015-03-12 (690 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
IpRoute:
 default via 172.16.20.21 dev eth0 proto static metric 100
 169.254.0.0/16 dev eth1 scope link metric 1000
 172.16.20.0/24 dev eth0 proto kernel scope link src 172.16.20.67 metric 100
 192.168.0.0/24 dev eth1 proto kernel scope link src 192.168.0.10 metric 100
IwConfig:
 lo no wireless extensions.

 eth1 no wireless extensions.

 eth0 no wireless extensions.
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
RfKill:

SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2016-03-11T09:44:29.848008
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH
 eth0 ethernet connected /org/freedesktop/NetworkManager/Devices/2 TN Wired decbd8d4-b045-4214-88c3-904bcabaa386 /org/freedesktop/NetworkManager/ActiveConnection/2
 eth1 ethernet connected /org/freedesktop/NetworkManager/Devices/1 Test Network c2e4c3e8-027e-4201-8486-824d32ee164f /org/freedesktop/NetworkManager/ActiveConnection/0
 lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/0 -- -- --
nmcli-nm:
 RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN
 running 1.2.2 connected started full enabled enabled enabled enabled enabled

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[James Cobban (7-webmaster)]

I had this issue yesterday on 17.10. The IPV4 address for my Ethernet interface vanished. I could not find any option in the network portion of settings to ask the DHCP for the IP address, and sudo service network-manager restart did not recover, so I rebooted the system. This is obviously an extremely rare situation and I do not know how to reproduce it. If there is no notification that the network manager can register for to detect this situation automatically then there should be a reinitialize button in the network settings GUI.