How can I completely remove NetworkManager?

First edit /etc/network/interfaces so that the ifup utility can be used to configure eth0 once NetworkManager is gone.

Remove NetworkManager from the system

sudo apt-get purge network-manager

Configure eth0 using ifup.

sudo ifup eth0

Gnome:

sudo apt-get remove --purge network-manager-gnome network-manager

KDE:

sudo apt-get remove --purge knetworkmanager network-manager

Unity : lol, Unity.

It might be worth it to disable it, configure your alternate setup, and then uninstall it.

Stopping and Disabling NetworkManager | help.ubuntu.com

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