Comment 16 for bug 1812760

I was able to verify this on Bionic:

rlaager@bison:~$ ip -6 route show
2600:2600::/64 dev ens3 proto kernel metric 256 pref medium
fe80::/64 dev ens3 proto kernel metric 256 pref medium
default via 2600:2600::254 dev ens3 proto static metric 1024 pref medium
rlaager@bison:~$ sudo apt update
...
rlaager@bison:~$ sudo apt install -t bionic-proposed systemd
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-image-4.15.0-34-generic linux-image-4.15.0-36-generic linux-image-4.15.0-43-generic linux-modules-4.15.0-34-generic linux-modules-4.15.0-36-generic linux-modules-4.15.0-43-generic
  linux-modules-extra-4.15.0-34-generic linux-modules-extra-4.15.0-36-generic linux-modules-extra-4.15.0-43-generic
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  libnss-resolve libnss-systemd libsystemd0
Suggested packages:
  systemd-container policykit-1
Recommended packages:
  libpam-systemd
The following packages will be upgraded:
  libnss-resolve libnss-systemd libsystemd0 systemd
4 upgraded, 0 newly installed, 0 to remove and 80 not upgraded.
Need to get 3,318 kB of archives.
After this operation, 3,072 B of additional disk space will be used.
Do you want to continue? [Y/n] Y
Get:1 http://mirror.steadfast.net/ubuntu bionic-proposed/main amd64 libnss-systemd amd64 237-3ubuntu10.20 [105 kB]
Get:2 http://mirror.steadfast.net/ubuntu bionic-proposed/universe amd64 libnss-resolve amd64 237-3ubuntu10.20 [107 kB]
Get:3 http://mirror.steadfast.net/ubuntu bionic-proposed/main amd64 systemd amd64 237-3ubuntu10.20 [2,902 kB]
Get:4 http://mirror.steadfast.net/ubuntu bionic-proposed/main amd64 libsystemd0 amd64 237-3ubuntu10.20 [204 kB]
Fetched 3,318 kB in 0s (13.0 MB/s)
(Reading database ... 64877 files and directories currently installed.)
Preparing to unpack .../libnss-systemd_237-3ubuntu10.20_amd64.deb ...
Unpacking libnss-systemd:amd64 (237-3ubuntu10.20) over (237-3ubuntu10.15) ...
Preparing to unpack .../libnss-resolve_237-3ubuntu10.20_amd64.deb ...
Unpacking libnss-resolve:amd64 (237-3ubuntu10.20) over (237-3ubuntu10.15) ...
Preparing to unpack .../systemd_237-3ubuntu10.20_amd64.deb ...
Unpacking systemd (237-3ubuntu10.20) over (237-3ubuntu10.15) ...
Preparing to unpack .../libsystemd0_237-3ubuntu10.20_amd64.deb ...
Unpacking libsystemd0:amd64 (237-3ubuntu10.20) over (237-3ubuntu10.15) ...
Setting up libsystemd0:amd64 (237-3ubuntu10.20) ...
Processing triggers for ureadahead (0.100.0-20) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Setting up systemd (237-3ubuntu10.20) ...
Setting up libnss-resolve:amd64 (237-3ubuntu10.20) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Processing triggers for dbus (1.12.2-1ubuntu1) ...
Setting up libnss-systemd:amd64 (237-3ubuntu10.20) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
rlaager@bison:~$ sudo systemctl daemon-reload
rlaager@bison:~$ sudo netplan apply
rlaager@bison:~$ ip -6 route show
2600:2600::/64 dev ens3 proto static src 2600:2600::26 metric 255 pref medium
2600:2600::/64 dev ens3 proto kernel metric 256 pref medium
fe80::/64 dev ens3 proto kernel metric 256 pref medium
default via 2600:2600::254 dev ens3 proto static src 2600:2600::26 metric 1024 pref medium
rlaager@bison:~$