Hi,
your log is rather short so I can't be sure, but I see this issue:
  Setting up openssh-server (1:7.6p1-4ubuntu0.1) ...
  awk: symbol lookup error: /usr/local/lib/libreadline.so.7: undefined symbol: 
UP

That in turn does not reproduce for me so it has to be some config/setup
on your machine and I wonder what it is.

I checked for similar cases and found a few where people had alternative 
(self-built/tarball install) libreadline*.so files in /lib or /usr/local/
Obviously if those are preferred by the linker and not matching what awk is 
built against it might fail.

Please take a look if you have any alien libreadline shared objects and remove 
them.
Then this should work as it is supposed to work.

I'd expect that awk fails all the time for you.
If it does you might check with:
  ldd /usr/bin/awk
where it resolves it's libreadline from

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https://bugs.launchpad.net/bugs/1802644

Title:
  package openssh-server 1:7.6p1-4ubuntu0.1 failed to install/upgrade:
  installed openssh-server package post-installation script subprocess
  returned error exit status 127

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