Have to manually "sudo ifconfig eth0 up" and "sudo dhclient eth0" after every reboot

[Walter Dietrich]

I did an upgrade with "sudo apt-get dist-upgrade", and it removed network-manager and network-manager-gnome. I could not connect to my LAN afer that. I was able to find instructions for downgrading the libnl packages at
https://askubuntu.com/questions/727127/last-upgrade-crashes-network-manager-no-internet-connection-no-applet

I am able to get online again by running the following commands
sudo ifconfig eth0 up
sudo dhclient eth0
(Fortunately, I have a Ethernet I can plug in to.) I have to do this every time I reboot. This is inconvenient as a usually use Desktop Sharing with another computer as the client. I use an SSH tunnel for security. This means that every time I reboot, I have to physically access the computer's console to enter the ifconfig and dhclient commands to get the computer back on the network. I tried to reinstall network-manager and network-manager-gnome, but the command results said there were dependencies that prevented the installation. The fixes in the web page referenced above do not help, so I'm reporting this as a bug.

Thanks for your assistance.

$ sudo lsb_release -rd
[sudo] password for wally:
Description: Ubuntu 14.04.1 LTS
Release: 14.04
$

$ apt-cache policy network-manager
network-manager:
  Installed: (none)
  Candidate: 0.9.8.8-0ubuntu7.1
  Version table:
     0.9.8.8-0ubuntu7.1 0
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
        100 /var/lib/dpkg/status
     0.9.8.8-0ubuntu7 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
$

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: network-manager (not installed)
ProcVersionSignature: Ubuntu 3.13.0-144.193-generic 3.13.11-ckt39
Uname: Linux 3.13.0-144-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.27
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Apr 6 21:21:27 2018
InstallationDate: Installed on 2014-10-22 (1262 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)

[Walter Dietrich (wallyd)]

Before I submitted this, I had run the following command, per the web page mentioned above.

sudo apt-get install libnl-3-200=3.2.21-1 libnl-route-3-200=3.2.21-1 libnl-genl-3-200=3.2.21-1

After submitting this, I ran the following commands:

sudo apt-get update
sudo apt-get install network-manager

network-manager was reinstalled, and my server gets connected to the LAN again automatically after I reboot. network-manager-gnome was also reinstalled. I'd like to know if I can safely do

sudo apt-mark unhold libnl-3-200 libnl-genl-3-200 libnl-route-3-200

For now, I'll just stick with the downgraded libnl packages as I don't want to have more networking problems.