Unwanted read-only network interface (ifupdown)

I have an Android TV box running Armbian 5.41 (Ubuntu 16.04.5). Since I changed from kodi-standalone to MATE, I've found a network issue. The box is connected via Ethernet, and MATE shows two interfaces: eth0 and ifupdown(eth0). I want to use eth0, because i can not set an static IP on ifupdown, because it's ready-only. Every time I restart MATE, it automatically connects to ifupdown, resulting in not having any network. I need the static IP, because I've got Pi-Hole running on it as well, with an enabled DHCP server. The static IP of eth0 has been set in network manager. How can i remove this interface or at least setting the normal eth0 as default? /etc/network/interfaces # Wired adapter #1 allow-hotplug eth0 no-auto-down eth0 iface eth0 inet dhcp #address 192.168.0.17 #netmask 255.255.255.0 #gateway 192.168.0.1 #dns-nameservers 8.8.8.8 8.8.4.4 # hwaddress ether # if you want to set MAC manually # pre-up /sbin/ifconfig eth0 mtu 3838 # setting MTU for DHCP, static just: mtu 3838 # Wireless adapter #1 # Armbian ships with network-manager installed by default. To save you time # and hassles consider using 'sudo nmtui' instead of configuring Wi-Fi settings # manually. The below lines are only meant as an example how configuration could # be done in an anachronistic way: # #allow-hotplug wlan0 #iface wlan0 inet dhcp #address 192.168.0.100 #netmask 255.255.255.0 #gateway 192.168.0.1 #dns-nameservers 8.8.8.8 8.8.4.4 # wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf # Disable power saving on compatible chipsets (prevents SSH/connection dropouts over WiFi) #wireless-mode Managed #wireless-power off # Local loopback auto lo iface lo inet loopback