network interfaces

on a server reboot, a new interface gets assigned my static ip instead of eth0.

on a previous reboot it was dummy0

to restore internet access, i have to log in via glish and run 'ip link delete dummy0' this assigns my public ip back to eth0

today after a reboot, i had a number of different network interfaces:

bond0
eth0
ifb0
lan1
lan2
lan3
lan4
wlan0
wlan1

I had no internet access again, because my static ip got assigned to ifb0

where are these interfaces coming from?

i only have the eth0 with my static ip in /etc/network/interfaces

Ubuntu xenial