Nope, I'm unable to reproduce the problem by adding "iface eth0 inet6 auto" and "iface eth0 inet dhcp" and running restart networking. I have not enabled proposed updates. Are there any other steps in the reproduction? I'm not sure that this machine has used the alternate installation, and it has been upgraded at least once.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/995165 Title: IPv4 connectivity broken after installing from ubuntu-12.04-alternate- amd64.iso Status in “network-manager” package in Ubuntu: Fix Released Status in “network-manager” source package in Precise: Fix Committed Bug description: [Impact] IPv6 is becoming increasingly popular and installations on IPv6-ready networks are becoming more frequent; this issue affects installations of the Desktop image from the alternate image (or using d-i in any other way) when IPv6 autoconfiguration or DHCPv6 is used. These installations will fail to recognize that the interface should be managed by NetworkManager after the installation because only the "iface X inet dhcp" line would be commented out, leaving another valid "iface X" line for "inet6" causing NetworkManager to ignore the device. The solution was to comment out all lines in /etc/network/interfaces pertaining to interface X: "auto X", "iface X inet", and "iface X inet6". [Test Case] 1a) With IPv6 autoconfiguration (for example, using radvd) or DHCPv6 available on the network: 1b) With no IPv6 available on the network: 2) Install Ubuntu from the alternate CD; or using d-i via a netboot image. 3) After the installation: a) Verify that NetworkManager properly handles all interfaces. b) Verify that the network interfaces configuration is commented out in /etc/network/interfaces. [Regression Potential] Untypical configurations may find devices that should be ignored by NetworkManager to be handled by it. Standard installations could fail to comment the necessary information from /etc/network/interfaces to allow for NetworkManager to do is job; or the file could be mangled to remove the "lo" interface, which would make unrelated services fail. --- To reproduce: - Download ubuntu-12.04-alternate-amd64.iso, sha256sum: f8d54df0afbab6a6248f6e2bcab3e68f01c04d52b0bb1f889d880ad3bc881ccb - Burn it to a USB flash drive from a completely up-to-date Ubuntu 10.04 LTS with UNetbootin - Install on a machine with both IPv4 and IPv6 connectivity - Log in to the newly installed system Current behaviour: - There is no IPv4 connectivity - NetworkManager doesn't show the wired interface in its dropdown Expected behaviour: - There is IPv4 connectivity - NetworkManager does show the wired interface in its dropdown Thoughts: I suspect this is because during the install my /etc/network/interfaces was created like so: ---BEGINS--- # 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 iface eth0 inet dhcp # This is an autoconfigured IPv6 interface iface eth0 inet6 auto ---ENDS--- Then network-manager-0.9.4.0/debian/ifblacklist_migrate.sh mutates the file to comment out a single line like so: #NetworkManager#iface eth0 inet dhcp i.e. the line iface eth0 inet6 auto remains intact This means that the /etc/network/interfaces file gives me IPv6 connectivity but not IPv4 connectivity. Furthermore, because there is an uncommented iface eth0 inet6 line, NetworkManager doesn't show me the interface in its dropdown. To fix: - The regular expression needs to be changed so that the iface eth0 inet6 auto line is also commented out To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/995165/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
