Just happened to me too:
root@gw:/etc# apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  eatmydata libeatmydata1 python3-blinker python3-jinja2 python3-json-pointer 
python3-jsonpatch python3-jsonschema python3-jwt python3-markupsafe 
python3-oauthlib
Use 'apt autoremove' to remove them.
The following packages will be upgraded:
  apport busybox-initramfs busybox-static docker.io initramfs-tools 
initramfs-tools-bin initramfs-tools-core landscape-common libidn11 
libnss-systemd libpam-modules libpam-modules-bin libpam-runtime libpam-systemd 
libpam0g libpci3 libseccomp2 libsystemd0
  libudev1 libx11-6 libx11-data libxcb1 pciutils python3-apport python3-gi 
python3-problem-report systemd systemd-sysv udev unattended-upgrades
30 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 54.0 MB of archives.
After this operation, 37.2 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 libpam0g 
amd64 1.1.8-3.6ubuntu2.18.04.1 [55.1 kB]
Get:2 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
libpam-modules-bin amd64 1.1.8-3.6ubuntu2.18.04.1 [36.7 kB]
Get:3 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
libpam-modules amd64 1.1.8-3.6ubuntu2.18.04.1 [242 kB]
Get:4 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
libnss-systemd amd64 237-3ubuntu10.15 [105 kB]
Get:5 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 libsystemd0 
amd64 237-3ubuntu10.15 [205 kB]
Get:6 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
libpam-systemd amd64 237-3ubuntu10.15 [108 kB]
Get:7 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 systemd 
amd64 237-3ubuntu10.15 [2,899 kB]
Get:8 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 udev amd64 
237-3ubuntu10.15 [1,100 kB]
Get:9 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 libudev1 
amd64 237-3ubuntu10.15 [54.2 kB]
Get:10 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
libpam-runtime all 1.1.8-3.6ubuntu2.18.04.1 [37.1 kB]
Get:11 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
initramfs-tools all 0.130ubuntu3.7 [9,592 B]
Get:12 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
initramfs-tools-core all 0.130ubuntu3.7 [48.1 kB]
Get:13 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
initramfs-tools-bin amd64 0.130ubuntu3.7 [12.8 kB]
Get:14 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
busybox-initramfs amd64 1:1.27.2-2ubuntu3.1 [166 kB]
Get:15 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
systemd-sysv amd64 237-3ubuntu10.15 [12.0 kB]
Get:16 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
libseccomp2 amd64 2.3.1-2.1ubuntu4.1 [39.1 kB]
Get:17 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 libidn11 
amd64 1.33-2.1ubuntu1.1 [45.9 kB]
Get:18 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 python3-gi 
amd64 3.26.1-2ubuntu1 [153 kB]
Get:19 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
busybox-static amd64 1:1.27.2-2ubuntu3.1 [918 kB]
Get:20 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 pciutils 
amd64 1:3.5.2-1ubuntu1.1 [257 kB]
Get:21 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 libpci3 
amd64 1:3.5.2-1ubuntu1.1 [24.1 kB]
Get:22 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
libx11-data all 2:1.6.4-3ubuntu0.2 [113 kB]
Get:23 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 libxcb1 
amd64 1.13-2~ubuntu18.04 [45.5 kB]
Get:24 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 libx11-6 
amd64 2:1.6.4-3ubuntu0.2 [569 kB]
Get:25 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
python3-problem-report all 2.20.9-0ubuntu7.6 [9,884 B]
Get:26 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
python3-apport all 2.20.9-0ubuntu7.6 [81.7 kB]
Get:27 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 apport all 
2.20.9-0ubuntu7.6 [124 kB]
Get:28 http://hu.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 
docker.io amd64 18.09.2-0ubuntu1~18.04.1 [46.4 MB]
Get:29 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
landscape-common amd64 18.01-0ubuntu3.3 [85.3 kB]
Get:30 http://hu.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
unattended-upgrades all 1.1ubuntu1.18.04.9 [40.0 kB]
Fetched 54.0 MB in 5s (11.2 MB/s)
Preconfiguring packages ...
(Reading database ... 115046 files and directories currently installed.)
Preparing to unpack .../libpam0g_1.1.8-3.6ubuntu2.18.04.1_amd64.deb ...
Unpacking libpam0g:amd64 (1.1.8-3.6ubuntu2.18.04.1) over (1.1.8-3.6ubuntu2) ...
Setting up libpam0g:amd64 (1.1.8-3.6ubuntu2.18.04.1) ...
(Reading database ... 115046 files and directories currently installed.)
Preparing to unpack .../libpam-modules-bin_1.1.8-3.6ubuntu2.18.04.1_amd64.deb 
...
Unpacking libpam-modules-bin (1.1.8-3.6ubuntu2.18.04.1) over (1.1.8-3.6ubuntu2) 
...
Setting up libpam-modules-bin (1.1.8-3.6ubuntu2.18.04.1) ...
(Reading database ... 115046 files and directories currently installed.)
Preparing to unpack .../libpam-modules_1.1.8-3.6ubuntu2.18.04.1_amd64.deb ...
Unpacking libpam-modules:amd64 (1.1.8-3.6ubuntu2.18.04.1) over 
(1.1.8-3.6ubuntu2) ...
Setting up libpam-modules:amd64 (1.1.8-3.6ubuntu2.18.04.1) ...
(Reading database ... 115046 files and directories currently installed.)
Preparing to unpack .../libnss-systemd_237-3ubuntu10.15_amd64.deb ...
Unpacking libnss-systemd:amd64 (237-3ubuntu10.15) over (237-3ubuntu10.13) ...
Preparing to unpack .../libsystemd0_237-3ubuntu10.15_amd64.deb ...
Unpacking libsystemd0:amd64 (237-3ubuntu10.15) over (237-3ubuntu10.13) ...
Setting up libsystemd0:amd64 (237-3ubuntu10.15) ...
(Reading database ... 115046 files and directories currently installed.)
Preparing to unpack .../libpam-systemd_237-3ubuntu10.15_amd64.deb ...
Unpacking libpam-systemd:amd64 (237-3ubuntu10.15) over (237-3ubuntu10.13) ...
Preparing to unpack .../systemd_237-3ubuntu10.15_amd64.deb ...
Unpacking systemd (237-3ubuntu10.15) over (237-3ubuntu10.13) ...
Preparing to unpack .../udev_237-3ubuntu10.15_amd64.deb ...
Unpacking udev (237-3ubuntu10.15) over (237-3ubuntu10.13) ...
Preparing to unpack .../libudev1_237-3ubuntu10.15_amd64.deb ...
Unpacking libudev1:amd64 (237-3ubuntu10.15) over (237-3ubuntu10.13) ...
Setting up libudev1:amd64 (237-3ubuntu10.15) ...
(Reading database ... 115046 files and directories currently installed.)
Preparing to unpack .../libpam-runtime_1.1.8-3.6ubuntu2.18.04.1_all.deb ...
Unpacking libpam-runtime (1.1.8-3.6ubuntu2.18.04.1) over (1.1.8-3.6ubuntu2) ...
Setting up libpam-runtime (1.1.8-3.6ubuntu2.18.04.1) ...
(Reading database ... 115046 files and directories currently installed.)
Preparing to unpack .../initramfs-tools_0.130ubuntu3.7_all.deb ...
Unpacking initramfs-tools (0.130ubuntu3.7) over (0.130ubuntu3.6) ...
Preparing to unpack .../initramfs-tools-core_0.130ubuntu3.7_all.deb ...
Unpacking initramfs-tools-core (0.130ubuntu3.7) over (0.130ubuntu3.6) ...
Preparing to unpack .../initramfs-tools-bin_0.130ubuntu3.7_amd64.deb ...
Unpacking initramfs-tools-bin (0.130ubuntu3.7) over (0.130ubuntu3.6) ...
Preparing to unpack .../busybox-initramfs_1%3a1.27.2-2ubuntu3.1_amd64.deb ...
Unpacking busybox-initramfs (1:1.27.2-2ubuntu3.1) over (1:1.27.2-2ubuntu3) ...
Setting up systemd (237-3ubuntu10.15) ...
Connection reset by 192.168.56.3 port 22
user@DESKTOP-FMS7LDB:~$ ssh user@192.168.56.3
ssh: connect to host 192.168.56.3 port 22: Resource temporarily unavailable

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https://bugs.launchpad.net/bugs/1782709

Title:
  Updating systemd kills network on bionic

Status in linux package in Ubuntu:
  Incomplete
Status in systemd package in Ubuntu:
  New

Bug description:
  I do have an ubuntu bionic server installation without a graphical interface. 
The server
  has two active network adapters, both connected to the internet. One is used 
for outgoing
  internet traffic, the other for incoming. The incoming adapter lives on a 
public network segment
  (something like 88.236.133.104/29). I do have multiple servers within this 
segment.

  Typically, I update the server regularly, meaning:

  * ssh to the incoming adapter: ssh 88.236.133.108
  * apt-get update
  * apt-get upgrade
  * apt-get dist-upgrade
  * apt-get clean
  * reboot

  It used to work ok.

  BUT: Today, "apt-get upgrade" seem to take really long when updating systemd.
  After a could of minutes, I realized that the ssh session became inactive. I 
couldn't type
  into it, I had to abort it via ~. .

  * ssh from the internet to the incoming adapter was not working anymore - ssh 
88.236.133.108
  * ssh via another server within the public network segment worked
      * ssh 88.236.133.106 -> ssh 88.236.133.108
  * After running "netplan apply" everything was fine again

  Here my netplan configuration (I changed the ip addresses):

  network:
    version: 2
    renderer: networkd
    ethernets:
      eno1:
        dhcp4: yes
      eno2:
        dhcp4: no
        addresses: [88.236.133.108/29]
        #gateway4: 88.236.133.105
        routes:
         - to: 0.0.0.0/0
           via: 88.236.133.105
           table: 120
        routing-policy:
         - from: 88.236.133.108/32
           table: 120
         - to: 88.236.133.108/32
           table: 120

  Unfortunately, I don't have the console output avalable anymore.
  Shall I provide additional info?

  Best regards, Uli
  --- 
  ProblemType: Bug
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jul 20 08:10 seq
   crw-rw---- 1 root audio 116, 33 Jul 20 08:10 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2018-07-14 (5 days ago)
  InstallationMedia: Ubuntu-Server 18.04 LTS "Bionic Beaver" - Release amd64 
(20180426)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  MachineType: IBM IBM System x -[794582G]-
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 mgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-23-generic 
root=UUID=a41b3020-8359-4fe2-8fc3-1c97011f71ec ro
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware                             1.173.1
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  Tags:  bionic
  Uname: Linux 4.15.0-23-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 05/07/2014
  dmi.bios.vendor: IBM Corp.
  dmi.bios.version: -[D6E162AUS-1.20]-
  dmi.board.asset.tag: (none)
  dmi.board.name: 00D4062
  dmi.board.vendor: IBM
  dmi.board.version: (none)
  dmi.chassis.asset.tag: none
  dmi.chassis.type: 23
  dmi.chassis.vendor: IBM
  dmi.chassis.version: none
  dmi.modalias: 
dmi:bvnIBMCorp.:bvr-[D6E162AUS-1.20]-:bd05/07/2014:svnIBM:pnIBMSystemx-[794582G]-:pvr00:rvnIBM:rn00D4062:rvr(none):cvnIBM:ct23:cvrnone:
  dmi.product.family: System x
  dmi.product.name: IBM System x -[794582G]-
  dmi.product.version: 00
  dmi.sys.vendor: IBM

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