The good news is that I have now build and tested Bacula version 7.4.1
with the patch for getting Bacula to properly link with MySQL 5.7 on
Ubuntu 16.04, and it does work.

The bad news is that the "out of the box" MySQL performs very badly to
the point of being unusable with Bacula -- it is clearly trashing the
disk and runs Bacula jobs 10-15 times slower than on previous MySQL
versions.  I suspect that someone has by default turned on a sync/flush
after every MySQL update.  Prior MySQL releases by Ubuntu were
relatively efficient.  Out of the box they were between 10-20% slower
than a slightly tuned PostgreSQL.  Now it is 10-15 times slower than an
untuned PostgreSQL out of the box on the same computer.

Please let me know if I should open a new ticket on this.

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https://bugs.launchpad.net/bugs/1570923

Title:
  bacula-dir won't start with "undefined symbol: mysql_init"

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