I have also seen this in 12.04 LTS AMD 64. In my failing environment, interface->dhcp is 1; interface->slaac is 1, and interface->dhcp6 is 0. The install syslog shows:
Network config complete Writing informative header Success! Writing loopback interface Success! Writing DHCP stanza for eth0 Writing SLAAC stanza for eth0 Success! /etc/network/interfaces shows as follows (sans some comments at top) ===== START ===== # 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 ===== END ===== If I comment out the #NetworkManager# comment, then my network is fine - ifconfig shows IPv4 and IPv6 addresses, but the Network manager reports unmanaged. -- 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: Confirmed Bug description: 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
