Thank you Lars.
The table .smatool/DayData is part of a databese named smatool tha was updated 
every boot bya a cron command.
I removed that cron command and the issue still persists.
I tried to change the root password of mysql.
Tried to purge everything related to mysql.
Tried to install mysql-server-5.6.
Nothing of these actions worked.
Now I reinstalled mysql-server-5.7 again and it is all the same as before. No 
mysql start at boot, no start with 'sudo start mysql' ("Job failed to start"). 
It starts only with the command 'sudo dpkg-reconfigure mysql-server-5.7'.
After that everything works, included the updating of my smatool db.

Only one change: the file /var/log/mysql/error.log disappear.

Maybe a future update of mysql or a complete reinstall of Xubuntu (but I
have no time to do this right now) could solve the problem.

Thanks for the time you dedicated to me.

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https://bugs.launchpad.net/bugs/1579489

Title:
  mysql-server won't start

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