Hi,
you have mysql installed but your database is broken.
>From your Log:
2017-12-20T13:59:10.910577Z 0 [Note] InnoDB: Log scan progressed past the 
checkpoint lsn 83231063627
2017-12-20T13:59:10.910600Z 0 [Note] InnoDB: Doing recovery: scanned up to log 
sequence number 83231064064
2017-12-20T13:59:10.911220Z 0 [ERROR] InnoDB: Ignoring the redo log due to 
missing MLOG_CHECKPOINT between the checkpoint 83231063627 and the end 
83231064064.
2017-12-20T13:59:10.911241Z 0 [ERROR] InnoDB: Plugin initialization aborted 
with error Generic error
2017-12-20T13:59:11.514745Z 0 [ERROR] Plugin 'InnoDB' init function returned 
error.
2017-12-20T13:59:11.514802Z 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE 
ENGINE failed.
2017-12-20T13:59:11.514812Z 0 [ERROR] Failed to initialize plugins.
2017-12-20T13:59:11.514817Z 0 [ERROR] Aborting

Due to that the service is failing to (re-)start.
But that is a requirement to upgrade the package (to do updates on the upgrade).

You can fixup the DB (or remove it if not needed) or remove mysql
completely if not used anyway.

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https://bugs.launchpad.net/bugs/1739427

Title:
  package  mysql-server-5.7 5.7.20-0ubuntu0.17.04.1 failed to
  install/upgrade: subprocess installed post-installation script re
  turned error exit status 1

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