On Ubuntu Linux, if you get a warning from PHP or a PHP framework about a missing php-gd library, try:

# sudo apt-get install php5-gd

This worked on Ubuntu Precise. It pulled in several dependencies and updated a few packages...

When working on Linux, you probably need to install programs and software packages from time to time.

On Ubuntu, to search for a package and see if it’s available:

# apt-cache search "package-name"

To install a new package: