Hi,
from your logs:
update-alternatives: using /etc/mysql/mysql.cnf to provide /etc/mysql/my.cnf 
(my.cnf) in auto mode
Renaming removed key_buffer and myisam-recover options (if present)
Job for mysql.service failed because the control process exited with error 
code. See "systemctl status mysql.service" and "journalctl -xe" for details.

You did not attach the mysql error log which usually is the next place
to check what happened.

But honestly 99% of issues like that are due to broken local config that makes 
the server fail to start/re-start.
So until data was provided to show this sisn't the case here I'll handle it 
like that case.

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https://bugs.launchpad.net/bugs/1751579

Title:
  package mysql-hostname-5.7 (not installed) failed to install/upgrade:
  el subproceso instalado el script post-installation devolvió el código
  de salida de error 1

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