Did you give the execution rights to bacula :

chown root:bacula /usr/bin/bconsole
chmod u=rwx,g=rx,o= /usr/bin/bconsole
chown root:bacula /etc/bacula/bconsole.conf
chmod u=rw,g=r,o= /etc/bacula/bconsole.conf

Did you put bacula in the right group :

sudo usermod -aG bacula www-data

Webacula installation procedure 
(http://www.java-tutorial.ch/ubuntu/webacula-installation-on-ubuntu)

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