Seems you upgraded from MySQL 5.7 which isn't supported by MariaDB 10.0.
You need a newer MariaDB version for that. This was also shown to you in
the terminal:
> [?1049lThe file /var/lib/mysql/debian-5.7.flag indicated a
> version that cannot automatically be upgraded. Therefore the
> previous data directory will be renamed to /var/lib/mysql-5.7 and
> a new data directory will be initialized at /var/lib/mysql.
> Please manually export/import your data (e.g. with mysqldump) if needed.
Please pay attention to what apt-get/dpkg tells you.
There is also some other bug that the mysqld daemon failed to restart.
That should be debugged by looking at the logs or `sudo journalclt -u
mariadb` like the terminal messages already guided you.
If you want somebody to fix this completely for you, I recommend you get
some paid IT support to look into it. If you suspect this is a bug that
should be fixed in the software and you want to contribute in the spirit
of open source, please do some deeper debugging yourself first and
present us with a richer bug report.
Thanks!
** Changed in: mariadb-10.0 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1868526
Title:
package mariadb-server-10.0 10.0.38-0ubuntu0.16.04.1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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