Why doesn't network-manager start at boot?

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http://askubuntu.com – I think this started happening a couple of months ago when I upgraded from 10.04 to 12.04. Whenever I reboot, network-manager does not start. I have to manually run sudo start network-manager, and then everything works fine. Things I have already tried (rebooting after each attempted fix): Verified that all of the /etc/rc*.d/*network-manager links exist the way they should. Since network-manager's upstart config file mentions local-filesystems, and my fstab had a reference to a USB HDD that is not connected, I commented that line out of the fstab. sudo dpkg-reconfigure network-manager and (HowTos)