Hi Matthew, thanks so much for taking the time to file a bug report.
This is a common problem, but not actually a bug I'm afraid.
Unpacking mysql-server-5.1 (from
.../mysql-server-5.1_5.1.63-0ubuntu0.11.04.1_i386.deb) ...
Selecting previously deselected package bacula-sd-mysql.
Because
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https://bugs.launchpad.net/bugs/1031568
Title:
package bacula-director-mysql 5.0.3-0ubuntu2 failed to
install/upgrade: subprocess installed post-installation script
