Comment 7 for bug 388060

Mathieu wrote:
> Would it be sufficient to just skip adding the "manual" method interfaces to /etc/network/interfaces

I am guessing that the interface was once defined as "inet manual" in order to prevent both ifup and NM from messing with it.

Omitting the stanza entirely will prevent ifup from messing with the interface.

In casper version 1.316 a snippet was added to 23networking which appears to deactivate NM in another way.

    if [ -n "${NETBOOT}" ] && [ -x /root/usr/sbin/NetworkManager ]; then
        # Disable Network Manager on netboot to avoid loosing connectivity to the media
        echo "manual" > /root/etc/init/network-manager.override
    fi