I can confirm that the "auto" configuration items in /etc/network/interfaces cause the symptoms described here.
After commenting out all of the "auto" items in /etc/network/interfaces except for "auto lo", NetworkManager is starting again automatically. Thanks Daniil for your research! -- 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/663735 Title: After upgrade to 12.04 NetworkManager does not start automatically on boot Status in “network-manager” package in Ubuntu: Confirmed Bug description: Binary package hint: network-manager Ubuntu 10.04 LTS On a regular Ubuntu 10.04 LTS (freshly installed), one has in the taskbar an icon representing 2 thick arrows up and down, On my portable, where Ubuntu 10.04LTS is present, but two months ago upgraded from 9.04, I have only an icon representing a wave with a red exclamation mark. With the mouse pointer on it, it shows in a balloon text: Networking disabled. Clicking on it, shows a balloon text with 'Network Manager not running $ sudo service network-manager status says: network-manager stop/waiting $ sudo service network-manager start says: network-manager, start/running, process 1981 but nothing is changed (still Networking disabled, NetworkManager not running as above) $ sudo service network-manager status says again: network-manager stop/waiting I can right click the icon and choose Edit connections ans change e.g. Method and set other IP settings, but this is not recorded (because NetworkManager is not running?) I had a manually edited /etc/network/interfaces in the past. I was advised to try putting in /etc/network/interfaces only auto lo iface lo inet loopback auto eth0 which I did and rebooted, but this was even worse: could not connect anymore to the internet AT ALL. Just to be able to write this bug report, I had to manually edit my /etc/network/interfaces again to auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp and reboot then a got a DHCP assigned IP again from our DHCP server over the local LAN I believe already in 9.04, I had 'NetworkManager not running' and not the normal icon in the taskbar (can't remember exactly how that icon looked, things in Ubuntu change all the time with every new upgrade (sigh) ...) ProblemType: Bug DistroRelease: Ubuntu 10.04 Package: network-manager 0.8-0ubuntu3 ProcVersionSignature: Ubuntu 2.6.32-25.44-generic 2.6.32.21+drm33.7 Uname: Linux 2.6.32-25-generic i686 Architecture: i386 CRDA: Error: [Errno 2] No such file or directory Date: Wed Oct 20 10:23:06 2010 IpRoute: 143.129.75.0/24 dev eth0 proto kernel scope link src 143.129.75.178 169.254.0.0/16 dev eth0 scope link metric 1000 default via 143.129.75.254 dev eth0 metric 100 Keyfiles: Error: [Errno 2] No such file or directory ProcEnviron: LANG=en_US.utf8 SHELL=/bin/bash SourcePackage: network-manager WpaSupplicantLog: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/663735/+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
