root@Ubuntu-1604-xenial-64-minimal ~ # apt update && apt upgrade
Hit:1 http://mirror.hetzner.de/ubuntu/packages xenial InRelease
Hit:2 http://mirror.hetzner.de/ubuntu/packages xenial-backports InRelease                                              
Hit:3 http://mirror.hetzner.de/ubuntu/packages xenial-updates InRelease                                                
Hit:4 http://mirror.hetzner.de/ubuntu/security xenial-security InRelease                                               
Hit:5 http://security.ubuntu.com/ubuntu xenial-security InRelease                                                      
Hit:6 http://de.archive.ubuntu.com/ubuntu xenial InRelease                                                             
Hit:7 http://de.archive.ubuntu.com/ubuntu xenial-updates InRelease                                                     
Hit:8 http://de.archive.ubuntu.com/ubuntu xenial-backports InRelease                                                   
Ign:9 http://download.webmin.com/download/repository sarge InRelease                                                   
Hit:10 http://download.webmin.com/download/repository sarge Release                                                    
Hit:11 http://dl.ubnt.com/unifi/debian testing InRelease                
Hit:13 https://deb.nodesource.com/node_7.x xenial InRelease
Reading package lists... Done 
Building dependency tree       
Reading state information... Done
34 packages can be upgraded. Run 'apt list --upgradable' to see them.
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
 libpam-systemd : Depends: systemd (= 229-4ubuntu19)
 systemd : Depends: libsystemd0 (= 229-4ubuntu17) but 229-4ubuntu19 is installed
E: Unmet dependencies. Try using -f.
root@Ubuntu-1604-xenial-64-minimal ~ # apt-get -f install
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  linux-headers-4.4.0-78 linux-headers-4.4.0-78-generic linux-image-4.4.0-78-generic
  linux-image-extra-4.4.0-78-generic
Use 'apt autoremove' to remove them.
The following additional packages will be installed:
  systemd
Suggested packages:
  systemd-ui systemd-container
The following packages will be upgraded:
  systemd
1 upgraded, 0 newly installed, 0 to remove and 33 not upgraded.
3 not fully installed or removed.
Need to get 0 B/3,811 kB of archives.
After this operation, 12.3 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
(Reading database ... 157791 files and directories currently installed.)
Preparing to unpack .../systemd_229-4ubuntu19_amd64.deb ...
Unpacking systemd (229-4ubuntu19) over (229-4ubuntu17) ...
Processing triggers for dbus (1.10.6-1ubuntu3.3) ...
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up systemd (229-4ubuntu19) ...
addgroup: The group `systemd-journal' already exists as a system group. Exiting.
Failed to try-restart systemd-networkd.service: Failed to activate service 'org.freedesktop.systemd1': timed out
See system logs and 'systemctl status systemd-networkd.service' for details.
Failed to try-restart systemd-resolved.service: Failed to activate service 'org.freedesktop.systemd1': timed out
See system logs and 'systemctl status systemd-resolved.service' for details.
Failed to try-restart systemd-timesyncd.service: Failed to activate service 'org.freedesktop.systemd1': timed out
See system logs and 'systemctl status systemd-timesyncd.service' for details.
Failed to retrieve unit: Failed to activate service 'org.freedesktop.systemd1': timed out
Setting up libapt-inst2.0:amd64 (1.2.24) ...
Setting up apt-utils (1.2.24) ...
Setting up libpam-systemd:amd64 (229-4ubuntu19) ...
Processing triggers for libc-bin (2.23-0ubuntu9) ...
W: Operation was interrupted before it could finish