Reading the log file that Stephan supplied... First we see three cases of successful connection.
May 8 14:12:32 d-charms NetworkManager: <info> (eth0): carrier is OFF May 8 14:12:32 d-charms NetworkManager: <info> (eth0): new Ethernet device (driver: 'r8169') May 8 14:12:32 d-charms NetworkManager: <info> (eth0): exported as /org/freedesktop/NetworkManager/Devices/0 May 8 14:12:32 d-charms NetworkManager: <info> (eth0): now managed May 8 14:12:32 d-charms NetworkManager: <info> (eth0): device state change: 1 -> 2 (reason 2) May 8 14:12:32 d-charms NetworkManager: <info> (eth0): bringing up device. [...] Then three cases, on the date that Stephan said things stopped working, where NM does nothing further with eth0 than the following. May 9 23:07:08 d-charms NetworkManager: <info> (eth0): carrier is OFF May 9 23:07:08 d-charms NetworkManager: <info> (eth0): new Ethernet device (driver: 'r8169') May 9 23:07:08 d-charms NetworkManager: <info> (eth0): exported as /org/freedesktop/NetworkManager/Devices/0 There is no reboot between the first group and the second group. Stephen: What happened between May 9 18:19:15 and May 9 23:07:08? Did you upgrade network-manager? ** Summary changed: - Regression: NetworkManager stopped managing eth0 even though it's not defined in /e/n/i + NetworkManager fails to manage eth0 even though "iface eth0" is not defined in /e/n/i -- r8169 -- 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/578012 Title: NetworkManager fails to manage eth0 even though "iface eth0" is not defined in /e/n/i -- r8169 Status in “network-manager” package in Ubuntu: Incomplete Bug description: Binary package hint: network-manager Since 2010-05-09, my wired ethernet is suddenly unmanaged with the KDE network manager applet hover text is "Unmanaged" ("Unverwaltet" in German) and clicking on it shows only grey text "Network management disabled" ("Netzwerkverwaltung deaktiviert."). I can still get an IP manually through "sudo dhclient eth0". Strange thing is that "Auto eth0" was gone already 2010-05-08, and I had to manually re-add a DHCP wired connection. But as of now, even this does not help. I have attached a recent copy of the daemon.log. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/578012/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
