For new installations, the /etc/network/interfaces file does have text
explaining that ifupdown is no longer used and network config is now
done via netplan.
For upgrades of systems using ifupdown, it is not removed, and should
still manage the networking, and changes to /e/n/i should still work.
To address your bug that systemd-resolved ignores any settings in e/n/i,
that's correct that systemd-resolved will not *directly* look at the
e/n/i config to find nameserver configuration. However, if ifupdown is
managing your system networking, then it will provide nameserver details
to systemd-resolved. The specific mechanism depends on your specific
network configuration (e.g. static vs dhcp) and if you have resolvconf
installed or not.
If you are having a specific problem with your system networking, please
feel free to add details about what is wrong.
** Changed in: systemd (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1823503
Title:
systemd-resolved ignores /etc/network/interfaces on Ubuntu 18.04
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