Hi Deb,
thank you taking the time to report this bug and helping to make Ubuntu better. 
                          

Relevant lines are:
May 02 12:03:51 hostname mysqld_safe[11430]: [108B blob data]
May 02 12:03:51 hostname mysqld_safe[11430]: Fatal error in defaults handling. 
Program aborted
May 02 12:03:51 hostname mysqld_safe[11430]: [98B blob data]
May 02 12:03:51 hostname mysqld_safe[11430]: Fatal error in defaults handling. 
Program aborted
May 02 12:03:51 hostname mysqld_safe[11430]: 
May 02 12:03:51 hostname mysqld_safe[11430]: Installation of system tables 
failed!  Examine the logs in
May 02 12:03:51 hostname mysqld_safe[11430]: /var/lib/mysql for more 
information.
May 02 12:03:51 hostname mysqld_safe[11430]: 
May 02 12:03:51 hostname mysqld_safe[11430]: The problem could be conflicting 
information in an external
May 02 12:03:51 hostname mysqld_safe[11430]: my.cnf files. You can ignore these 
by doing:
May 02 12:03:51 hostname mysqld_safe[11430]: 
May 02 12:03:51 hostname mysqld_safe[11430]:     shell> 
/usr/bin/scripts/mysql_install_db --defaults-file=~/.my.cnf
May 02 12:03:51 hostname mysqld_safe[11430]: 
May 02 12:03:51 hostname mysqld_safe[11430]: You can also try to start the 
mysqld daemon with:
May 02 12:03:51 hostname mysqld_safe[11430]: 
May 02 12:03:51 hostname mysqld_safe[11430]:     shell> /usr/sbin/mysqld 
--skip-grant --general-log &
May 02 12:03:51 hostname mysqld_safe[11430]: 
May 02 12:03:51 hostname mysqld_safe[11430]: and use the command line tool 
/usr/bin/mysql
May 02 12:03:51 hostname mysqld_safe[11430]: to connect to the mysql database 
and look at the grant tables:
May 02 12:03:51 hostname mysqld_safe[11430]: 
May 02 12:03:51 hostname mysqld_safe[11430]:     shell> /usr/bin/mysql -u root 
mysql
May 02 12:03:51 hostname mysqld_safe[11430]:     mysql> show tables;
May 02 12:03:51 hostname mysqld_safe[11430]: 
May 02 12:03:51 hostname mysqld_safe[11430]: Try 'mysqld --help' if you have 
problems with paths.  Using
May 02 12:03:51 hostname mysqld_safe[11430]: --general-log gives you a log in 
/var/lib/mysql that may be helpful.
May 02 12:03:51 hostname mysqld_safe[11430]: 
May 02 12:03:51 hostname mysqld_safe[11430]: The latest information about 
mysql_install_db is available at
May 02 12:03:51 hostname mysqld_safe[11430]: 
https://mariadb.com/kb/en/installing-system-tables-mysql_install_db
May 02 12:03:51 hostname mysqld_safe[11430]: MariaDB is hosted on launchpad; 
You can find the latest source and
May 02 12:03:51 hostname mysqld_safe[11430]: email lists at 
http://launchpad.net/maria
May 02 12:03:51 hostname mysqld_safe[11430]: 
May 02 12:03:51 hostname mysqld_safe[11430]: Please check all of the above 
before submitting a bug report
May 02 12:03:51 hostname mysqld_safe[11430]: at http://mariadb.org/jira
May 02 12:03:51 hostname mysqld_safe[11430]: 
May 02 12:03:51 hostname mysqld_safe[11455]: [98B blob data]
May 02 12:03:51 hostname mysqld_safe[11455]: Fatal error in defaults handling. 
Program aborted

Could you try one of these?
Could you provide the logs of DB?
$ sudo cat /var/log/mysql/error.log

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https://bugs.launchpad.net/bugs/1687556

Title:
  package mariadb-server-10.0 10.0.29-0ubuntu0.16.04.1 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

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