*** This bug is a duplicate of bug 1490071 ***
    https://bugs.launchpad.net/bugs/1490071

>From the terminal log, it seems you have previously installed MariaDB 10.0:
Przygotowywanie do rozpakowania pakietu 
.../mysql-server-5.7_5.7.12-0ubuntu1_amd64.deb ...
Aborting downgrade from (at least) 10.0 to 5.7.
If are sure you want to downgrade to 5.7, remove the file
/var/lib/mysql/debian-*.flag and try installing again.
dpkg: błąd przetwarzania archiwum 
/var/cache/apt/archives/mysql-server-5.7_5.7.12-0ubuntu1_amd64.deb (--unpack):
 podproces nowy skrypt pre-installation zwrócił kod błędu 1

You can remove the /var/lib/mysql/debian*.flag file and try again, but
since MariaDB and MySQL 5.7 are not really compatible, I suggest making
a backup of /var/lib/mysql first.

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https://bugs.launchpad.net/bugs/1587106

Title:
  package mysql-server-5.7 (not installed) failed to install/upgrade:
  podproces nowy skrypt pre-installation zwrócił kod błędu 1

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