Comment 39 for bug 1860926

Using ubuntu-20.04-live-server-amd64.iso I created an USB and did fresh install, after fresh install I ran apt get update followed by apt get upgrade, I then removed the existing yaml in /etc/netplan and added 99_config.yaml:

labuser@lab:~$ sudo nano /etc/netplan/99_config.yaml
labuser@lab:~$ sudo cat /etc/netplan/99_config.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    enp0s25:
      dhcp4: no
      dhcp6: no
  bridges:
    br0:
      interfaces: [enp0s25]
      dhcp4: no
      addresses: [10.59.2.57/24]
      gateway4: 10.59.2.1
      nameservers:
          search: [mydomain, otherdomain]
          addresses: [209.18.47.61, 209.18.47.62]
labuser@lab:~$ sudo shutdown -r
labuser@lab:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 3c:d9:2b:4f:01:80 brd ff:ff:ff:ff:ff:ff
3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 3c:d9:2b:4f:01:80 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::ac4c:ffff:fe1b:21b7/64 scope link
       valid_lft forever preferred_lft forever
labuser@lab:~$ sudo net apply
labuser@lab:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 3c:d9:2b:4f:01:80 brd ff:ff:ff:ff:ff:ff
3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 3c:d9:2b:4f:01:80 brd ff:ff:ff:ff:ff:ff
    inet 10.59.2.57/24 brd 10.59.2.255 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::ac4c:ffff:fe1b:21b7/64 scope link
       valid_lft forever preferred_lft forever
labuser@lab:~$ dpkg -l systemd
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-==============-============-=================================
ii systemd 245.4-4ubuntu3 amd64 system and service manager
labuser@lab:~$ cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
labuser@lab:~$ sudo nano /etc/apt/sources.list
labuser@lab:~$ sudo cat /etc/apt/sources.list | grep proposed
deb http://archive.ubuntu.com/ubuntu/ focal-proposed restricted main multiverse universe
labuser@lab:~$ sudo apt update
labuser@lab:~$ sudo apt install systemd
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  libnss-systemd libpam-systemd libsystemd0 systemd-sysv systemd-timesyncd
Suggested packages:
  systemd-container
The following packages will be upgraded:
  libnss-systemd libpam-systemd libsystemd0 systemd systemd-sysv
  systemd-timesyncd
6 upgraded, 0 newly installed, 0 to remove and 15 not upgraded.
Need to get 4385 kB of archives.
After this operation, 9216 B of additional disk space will be used.
Do you want to continue? [Y/n]
labuser@lab:~$ sudo shutdown -r
labuser@lab:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 3c:d9:2b:4f:01:80 brd ff:ff:ff:ff:ff:ff
3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 3c:d9:2b:4f:01:80 brd ff:ff:ff:ff:ff:ff
    inet 10.59.2.57/24 brd 10.59.2.255 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::84eb:bdff:feb1:f4e2/64 scope link
       valid_lft forever preferred_lft forever
labuser@lab:~$ dpkg -l systemd
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-================-============-==============================>
ii systemd 245.4-4ubuntu3.1 amd64 system and service manager

systemd was updated from 245.4-4ubuntu3 to 245.4-4ubuntu3.1 (proposed) and after reboot I was able to get static IP.