In that case I would remove one at a time starting with eth1 as eth0 is normally wired network. Basically network manager will only manage a wifi card that isn't already managed so you need to remove the cards details from interfaces so that network manager can use it.
In that case I would remove one at a time starting with eth1 as eth0 is normally wired network. Basically network manager will only manage a wifi card that isn't already managed so you need to remove the cards details from interfaces so that network manager can use it.