network interfaces and network-manager fail to load on boot

[Adam Colligan]

This is a sporadic problem on boot of this system (an HP Envy x360).

After boot, both before and after login, there is no network connectivity. The network-manager GUI indicator does not load, and I am unable to bring "up" any interfaces manually. A full reboot is required, which generally results in normal operation.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: network-manager 1.0.4-0ubuntu5.2
ProcVersionSignature: Ubuntu 4.2.0-29.34-generic 4.2.8-ckt3
Uname: Linux 4.2.0-29-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Feb 17 16:40:00 2016
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2014-08-10 (556 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
IpRoute:

SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-con: Error: command ['nmcli', '-f', 'all', 'con'] failed with exit code 8: Error: NetworkManager is not running.
nmcli-dev: Error: command ['nmcli', '-f', 'all', 'dev'] failed with exit code 8: Error: NetworkManager is not running.
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.