Hi Gary,
thank you for your report and your help to make Ubuntu better.

>From the log:
/var/lib/dpkg/info/mysql-server-5.7.postinst: line 16: 32700 Killed             
     mysqld --user=mysql --init-file="$1" --socket="$tmpdir/mysqld.sock" 
--pid-file="$tmpdir/mysqld.pid" > /dev/null 2>&1
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 137

There are issues in the mysql error log:
  I see that already exists "ERROR: 1050  Table 'plugin' already exists"
  But that is a known issue (https://bugs.mysql.com/bug.php?id=80642) and the 
postinst handles that with a || true

The code path is also used to set a PW if set via debconf (not in your
upgrade case I'd think).


And finally to alter the user after auth_socket plugin is installed.
I'd assume that the code got killed while executing those:
      USE mysql;"
      ALTER USER 'root'@'localhost' IDENTIFIED WITH 'auth_socket';"
      # Bug: http://bugs.mysql.com/bug.php?id=80632                             
    
      UPDATE user SET password_expired='N', account_locked='N' WHERE 
user='root';"
      FLUSH PRIVILEGES;"
      SHUTDOWN;"
      run_init_sql "$initfile" <- runs the commands above.


But the mysql log has only valid shutdowns later on.
So the question is what killed the call to mysql in your case.

I beg a pardon, do you have any other data what happened while upgrading.
Did other than that your do-release-upgrade finish and if so is mysql now 
properly working.
Is a new upgrade (or install --reinstall) of mysql-server-5.7 working for you 
now?

** Bug watch added: MySQL Bug System #80642
   http://bugs.mysql.com/bug.php?id=80642

** Bug watch added: MySQL Bug System #80632
   http://bugs.mysql.com/bug.php?id=80632

** Changed in: mysql-5.7 (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1653900

Title:
  package mysql-server-5.7 5.7.16-0ubuntu0.16.04.1 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 137

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