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Network Manager not running error on Ubuntu 12.04 (FIXED)

I upgraded my Linux system (Ubuntu Server 12.04 LTS) a few minutes ago. And, my network manager stop running on startup. So , if you happen to experience the same error with your network manager, try the following command.

Open your terminal, type:
sudo gedit /etc/network/interfaces

And remove those lines that come AFTER iface lo inet loopback:
auto eth0 iface eth0 inet dhcp

Your /etc/network/interfaces file should said:
auto lo iface lo inet loopback

Make sure to save the file before you close anything. Reboot the system.

The problem was each time you start your computer, Network Manager try to auto connect using the wired connection as your primary connection instead of the wireless connection.

This solution work if you are getting that error message about:
"waiting up to 60 seconds more for network configuration..."

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