Comment 3 for bug 1591249

I read in some comments that the format of /etc/network/interfaces can confuse Ubuntu's back-end processing for ncftool. I tried removing all comments and simplifying that file as

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source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

auto eno1
allow-bond eno1
iface eno1 inet manual
bond-master bond0

auto eno2
allow-bond eno2
iface eno2 inet manual
bond-master bond0

auto bond0
iface bond0 inet static
address 192.168.1.16
gateway 192.168.1.1
netmask 255.255.255.0
bond-mode 4
bond-slaves eno1 eno2

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and rebooted. It did not solve the issue.