Public bug reported:

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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: bionic

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

Title:
  Updating systemd kills network on bionic

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