12.04 - network manager not started at boot

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http://askubuntu.com – I am on Ubuntu 12.04, 64-bit, fresh install. I have a wired connection (eth1 interface), the IP address is assigned by DHCP, and PEAP authentication (wpa_supplicant) is set up. My problem is that network does not start at boot. I have to log in without internet connection, and then I have to start network-manager manually (sudo start network-manager). It works, the connection starts and I am online. So my problem is why network manager does not start at boot? In /var/log/syslog I found the following messages: init: network-interface (lo) pre-start process (589) terminated with status 1 init (HowTos)