Intermittent ipv4 connectivity on bionic beaver

[jeremy-list]

To replicate:

Connect to a wifi network (wired untested). The problem occurs most consistently for DHCP configured connections but is also a significant problem for manually configured connection.

Expected results:

IPv4 and IPv6 should both auto-configure correctly and be usable: as they were in previous versions of Ubuntu, and still are on other devices and operating systems.

Actual results:

IPv6 is automatically configured correctly and I have no difficulty using IPv6 services. Most of the time no IPv4 address is configured. Manually configuring an IPv4 address is possible but usually does not result in a working IPv4 connection (pinging the gateway gives "destination host unreachable")

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: network-manager 1.10.6-2ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Jun 7 20:05:56 2018
EcryptfsInUse: Yes
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2018-05-11 (26 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
IpRoute:
 default via 192.168.178.1 dev wlp2s0 proto static metric 600
 169.254.0.0/16 dev wlp2s0 scope link metric 1000
 192.168.178.0/24 dev wlp2s0 proto kernel scope link src 192.168.178.28 metric 600
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=false
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH
 wlp2s0 wifi connected /org/freedesktop/NetworkManager/Devices/3 2degrees Broadband - D377 10b8508a-4b0a-4ec4-9adb-e30685236fb7 /org/freedesktop/NetworkManager/ActiveConnection/6
 B8:C1:11:CA:B7:3A bt disconnected /org/freedesktop/NetworkManager/Devices/4 -- -- --
 enp1s0 ethernet unavailable /org/freedesktop/NetworkManager/Devices/2 -- -- --
 lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/1 -- -- --
nmcli-nm:
 RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN
 running 1.10.6 connected started full enabled enabled enabled enabled disabled