OpenEuphoria

If you installed using the deb package, you shouldn't need to do anything like this to get started. The binaries get installed to /usr/bin which should already be on your path. You shouldn't need to update /etc/euphoria/eu.cfg at all. You can create more tailored configuration files that only affect your user or even a particular project, but for just getting started, you shouldn't have to do any of that.

What happens if you type "eui" on the command line? You should get something like this:

{{{ $ eui Euphoria Interpreter v4.0.5 development Linux, Using System Memory Revision Date: 2012-10-15 09:43:49, Id: 5743:62d94559f849

ERROR: Must specify the file to be interpreted on the command line

You shouldn't need to use sudo. ed.ex is included, and a few people use it. Most people use other editors. I would recommend taking a look at wxIDE. There are 32 and 64-bit versions available. It was developed on Kubuntu, so it should run on Mint (you may need to install wxWidgets if you don't already have it on your system).

Matt