libgd-securityimage-perl software package provides security image (captcha) generator, you can install in your Ubuntu 17.04 (Zesty Zapus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libgd-securityimage-perl
libgd-securityimage-perl is installed in your system.
Make ensure the libgd-securityimage-perl package were installed using the commands given below,
$ sudo dpkg-query -l | grep libgd-securityimage-perl *
You will get with libgd-securityimage-perl package name, version, architecture and description in a table
| Distro | Ubuntu 17 04 zesty zapus |
| Section | Perl |
| Package | libgd-securityimage-perl |
| Version | 1.73-2 |
| Description | security image (captcha) generator |
| Sub Section | Perl |