Hi,
from your log:
180419 12:39:41 [ERROR] Slave I/O: error connecting to master 
'[email protected]:3306' - retry-time: 60  retries: 86400, Error_code: 
2003

This is an individual config you have set up that currently fails to initialize.
You have to fix your config so that the server can actually work, that will 
unblock the updates.

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https://bugs.launchpad.net/bugs/1765246

Title:
  package mysql-server-5.7 5.7.21-0ubuntu0.16.04.1 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

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