Fatal error: Call to undefined function imagecreatetruecolor()

RickiEme

Hello all, I just finished installing Fuel. After login I went to Blog/Posts and clicked on the first and only post ("a long, long...")
Clicked on View button and I get this error:

Fatal error: Call to undefined function imagecreatetruecolor() in ../fuel/modules/blog/libraries/Captcha.php on line 102

This is the code in line 102 of Captcha.php:

$img = imagecreatetruecolor( $this->img_width, $this->img_height);

I get the same error if I browse to fuel/blog and click on the blog's entry title.

Thanks for your help!

RickiEme

Pardon my newbieness The error was due to not having php5-gd installed.
In case anyone runs into the same issue here's the how-to
http://www.cyberciti.biz/faq/ubuntu-linux-install-or-add-php-gd-support-to-apache/