Comment 15 for bug 1911187

# VERIFICATION FOCAL

Installed systemd from -proposed :
# dpkg -l | grep systemd
ii libnss-resolve:amd64 245.4-4ubuntu3.5 amd64 nss module to resolve names via systemd-resolved
ii libnss-systemd:amd64 245.4-4ubuntu3.5 amd64 nss module providing dynamic user and group name resolution
ii libpam-systemd:amd64 245.4-4ubuntu3.5 amd64 system and service manager - PAM module
ii libsystemd-dev:amd64 245.4-4ubuntu3.5 amd64 systemd utility library - development files
ii libsystemd0:amd64 245.4-4ubuntu3.5 amd64 systemd utility library
ii networkd-dispatcher 2.0.1-1 all Dispatcher service for systemd-networkd connection status changes
ii systemd 245.4-4ubuntu3.5 amd64 system and service manager
ii systemd-container 245.4-4ubuntu3.5 amd64 systemd container/nspawn tools
ii systemd-journal-remote 245.4-4ubuntu3.5 amd64 tools for sending and receiving remote journal logs
ii systemd-sysv 245.4-4ubuntu3.5 amd64 system and service manager - SysV links
ii systemd-tests 245.4-4ubuntu3.5 amd64 tests for systemd
ii systemd-timesyncd 245.4-4ubuntu3.5 amd64 minimalistic service to synchronize local time with NTP servers

Following test plan from description

# systemctl stop dbus.service
# systemctl stop dbus.socket
# shutdown +1 -r "REBOOT!"
Failed to set wall message, ignoring: Connection timed out
Failed to call ScheduleShutdown in logind, no action will be taken: Connection timed out

Machine does not reboot as expected.