Public bug reported:
When installing Ubuntu Desktop 12.04 with debian-installer on a network
with IPv6 enabled, NetworkManager disabled network interfaces from
automatically configuring via DHCP in /etc/network/interfaces, but does
not disable them from automatically configuring IPv6. This prevents
NetworkManager from taking over control and managing the network
interface because it still appears to be maintained by the ifupdown, but
has IPv4 disabled from configuring at all. The resultant
/etc/network/interfaces file looks like this:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
#NetworkManager#iface eth0 inet dhcp
# This is an autoconfigured IPv6 interface
iface eth0 inet6 auto
Because there is a non-commented iface line for eth0, NetworkManager never
takes over management. My system is:
Description: Ubuntu 12.04 LTS
Release: 12.04
network-manager 0.9.4.0-0ubuntu4
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1005091
Title:
NetworkManager does not manage device after install on IPv6 network
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