libgeos-ruby1.8 software package provides Transitional package from libgeos-ruby1.8 to ruby-geos, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libgeos-ruby1.8
libgeos-ruby1.8 is installed in your system.
Make ensure the libgeos-ruby1.8 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libgeos-ruby1.8 *
You will get with libgeos-ruby1.8 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Ruby |
| Package | libgeos-ruby1.8 |
| Version | 3.4.2-6 |
| Description | Transitional package from libgeos-ruby1.8 to ruby-geos |
| Sub Section | Ruby |