Ivan, ifupdown (eth0) is the configuration your have in /etc/network/interfaces. by turning on managed=true you opted-in to get that system connection presented. If you dont want it to appear at all, you can remove it from /etc/network/interfaces .. or just use it as it should contain the static config you previously had in /etc/network/interfaces.
Ivan, ifupdown (eth0) is the configuration your have in /etc/network/ interfaces. by turning on managed=true you opted-in to get that system connection presented. If you dont want it to appear at all, you can remove it from /etc/network/ interfaces .. or just use it as it should contain the static config you previously had in /etc/network/ interfaces.