Comment 4 for bug 1813667

In a bionic and cosmic container, added proposed and successfully installed the latest cloud-init:

18.5-45-g3554ffe8-0ubuntu1~18.04.1 on bionic
18.5-45-g3554ffe8-0ubuntu1~18.10.1 on cosmic

Confirmed neither package was no longer requiring nplan via apt-cache data.

In Bionic:

root@b:~# apt-cache show cloud-init
Package: cloud-init
Architecture: all
Version: 18.5-45-g3554ffe8-0ubuntu1~18.04.1
Priority: extra
Section: admin
Origin: Ubuntu
Maintainer: Ubuntu Developers <email address hidden>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 1906
Depends: cloud-guest-utils | cloud-utils, isc-dhcp-client, iproute2, netplan.io | ifupdown, procps, python3, python3-requests, python3-serial, debconf (>= 0.5) | debconf-2.0, python3-configobj, python3-jinja2, python3-jsonpatch, python3-jsonschema, python3-oauthlib, python3-six, python3-yaml, python3:any (>= 3.3.2-2~)
Recommends: eatmydata, gdisk, software-properties-common

In Cosmic:
root@c:~# apt-cache show cloud-init
Package: cloud-init
Architecture: all
Version: 18.5-45-g3554ffe8-0ubuntu1~18.10.1
Priority: extra
Section: admin
Origin: Ubuntu
Maintainer: Ubuntu Developers <email address hidden>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 1907
Depends: cloud-guest-utils | cloud-utils, isc-dhcp-client, iproute2, netplan.io | ifupdown, procps, python3, python3-requests, python3-serial, debconf (>= 0.5) | debconf-2.0, python3-configobj, python3-jinja2, python3-jsonpatch, python3-jsonschema, python3-oauthlib, python3-six, python3-yaml, python3:any
Recommends: eatmydata, gdisk, software-properties-common

Previous versions of cloud-init showed a depends on "nplan | ifupdown".

I also went and purged nplan before an install of the proposed version of cloud-init and verified that it did not install nplan afterwards.

Marking verification-done-bionic and verification-done-cosmic.