Getting ruby and rails to run on Ubuntu 18.04LTS is certainly not easy.
Background: I'm not a ruby programmer. I'm just trying to get my redmine site up and running again after upgrading to 18.04.
First, I tried installing redmine directly from Ubuntu. That failed miserably. (sorry I don't remember everything that happened. But I believe it had to do with not finding an openssl library that was clearly present). I had hopes this would just install all of the proper dependencies with no errors.
Then, i tried following the instructions on redmine.com, which suggests not using the packaged install. That didn't work very well either. At one point, I ended up at the same openssl nonsense.
Now, I tried these instructions, and ruby seems to install OK with rbenv (although I don't really like it installing into a hidden directory in my home directory, with no apparent option to select the install directory). But rails falls flat at the nodejs install. I get: "rvm: command not found".
I found rvm in /usr/share/rvm/bin, but adding this to my path in .bashrc doesn't fix it.
I don't remember ruby/rails being this much of a pain under 12.04. Is there an easier way?