>From the log:
Setting up mysql-server-5.7 (5.7.17-0ubuntu0.16.04.1) ...
mysql_upgrade: Got error: 1045: Access denied for user 
'debian-sys-maint'@'localhost' (using password: YES) while connecting to the 
MySQL server
Upgrade process encountered error and will not continue.
mysql_upgrade failed with exit status 11
dpkg: error processing package mysql-server-5.7 (--configure):

That matched the mysql error log:
2017-01-28T18:48:37.511488Z 0 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.7.17-0ubuntu0.16.04.1'  socket: '/var/run/mysqld/mysqld.sock'  
port: 3306  (Ubuntu)
2017-01-28T18:48:38.201169Z 3 [Note] Access denied for user 'root'@'localhost' 
(using password: NO)
2017-01-28T18:48:38.204196Z 4 [Note] Access denied for user 
'debian-sys-maint'@'localhost' (using password: YES)


It needs to perform some actions on upgrade.
IIRC it uses the root socket (or prompts you) to create a temp access and uses 
that for the upgrades.

Was any modifications to the user setup done that might cause this?

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

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https://bugs.launchpad.net/bugs/1660065

Title:
  package mysql-server-5.7 5.7.17-0ubuntu0.16.04.1 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

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