I'm using Debian 6. I uninstalled ruby1.8, and then I installed ruby1.9.1.
If I type "which ruby" at the command line, it doesn't output anything. It seems like it doesn't recognize it.
Ruby installs on Debian/Ubuntu don't seem to generate the symbolic /usr/bin/ruby link to the specific install you have (theoretically, so that you can have multiple versions installed point to whatever version you want to use as your default).
should get you rolling. If