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.
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https://bugs.launchpad.net/bugs/1660574
Title:
IPv4 Address Lost 8 Days After Previous DHCP Allocation
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