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I have installed a support ticket system with captcha enabled and everything works well except the captcha images does not display.

It seems that the GD Graphics Library does not configured with PHP by default. However Ubuntu comes with package called php5-gd. Just type following command to install this module:

And then restart Apache

OTRS is an open-source Issue tracking system software package which a company, organisation or institution can use to assign tickets to incoming queries, thereby greatly facilitating the handling of support requests and other customer traffic. The most exciting is it is already contained in the Ubuntu package repositories. Installing OTRS is easy as 1-2-3!

1. Install OTRS package and dependencies:

2. Copy the file /etc/otrs/apache2-httpd.include.conf to /etc/apache2/conf.d.

3. Restart Apache service:

4. Use the following address to access the web installer, then follow the steps and setup the system.

5. Restart Apache again:

That’s all. Now, you can visit admin interface at http://localhost/otrs/index.pl, and customer interface at http://localhost/otrs/customer.pl.