Public bug reported:

I have installed ubuntu server 18.04 on one of my machines.
I can access the machine only via ssh.

Typically, I run these commands from time to time:

- ssh root@{machine}
- apt-get update
- apt-get upgrade

I observed at least two times now that "apt-get upgrade" doesn't complete. It 
hangs
on this:

  ...
  Vorbereitung zum Entpacken von .../libudev1_237-3ubuntu10.11_amd64.deb ...
  Entpacken von libudev1:amd64 (237-3ubuntu10.11) ├╝ber (237-3ubuntu10.9) ...
  libudev1:amd64 (237-3ubuntu10.11) wird eingerichtet ...
  systemd (237-3ubuntu10.11) wird eingerichtet ...

The ssh session becomes unresponsive.

I am not able to ssh from my desktop into the machine again.
I have to ssh into a neighbor of the machine running within the same subnet. 
From that, I
could ssh into the machine and run "netplan apply". Afterwards, everything is 
fine.

Please note that I do use policy routing.

Before "netplan apply":
  root@samson:~# ip rule list
  0:    from all lookup local 
  32766:        from all lookup main 
  32767:        from all lookup default 

After "netplan apply":
  root@samson:~# ip rule list
  0:    from all lookup local 
  0:    from {ip-address} lookup 120 
  0:    from all to {ip-address} lookup 120 
  32766:        from all lookup main 
  32767:        from all lookup default

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1811348

Title:
  ubuntu server 18.04.1 session hangs when updating systemd via ssh
  session

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