This question is probably pretty stupid/n00bish/inappropriate/localised/sparkly cake, so downvote all you like as long as I get the answer, as I wish very much to be able to go through the koans. :)
I am trying to get this to work. (GitHub is here) I've downloaded and extracted it, and the folder is in my Documents directory (I renamed it ruby_koans from the default name). I've been messing around with this all day and can't get it to run in Konsole. :/
I use
cd /home/sophia/Documents
to move to the directory Documents, which contains the ruby_koans file.
I have no idea what to do after that, as Rake seems to be broken, and I probably installed Autotest incorrectly :S
And, before posting here, I already asked #ruby and #kubuntu on freenode. ._.
Try to install the koans from http://rubykoans.com/
They have detailed installation instructions and a troubleshooting section.
If for some reason things still don't work properly, then you should seek help from a real-life programmer friend who has done this before :)
old answer:
Please, try to run the "path_to_enlightenment.rb" file inside the "koans" directory.
cd koans
ruby path_to_enlightenment.rb
That doesn't use rake. If that doesn't work, then your ruby installation may be broken.
The first line of the "path_to_enlightenment" is:
LOAD_PATH << File.dirname(__FILE__).
This makes "require" look for files in the current directory.
Perhaps File.dirname(__FILE__) does not return the proper value(for some reason).
Try and replace File.dirname(__FILE__) with the absolute path of the directory in which the koans are. I.e. "/home/MYUSERNAME/ruby_koans/koans/".
If I had to guess, I'd say the problem is that the "Documents" folder has an uppercase D in it. You can also try and move the project somewhere else.