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 Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/995165 Title: IPv4 connectivity broken after installing from ubuntu-12.04-alternate- amd64.iso To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/995165/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
