Running Lisp on Linux

Where does Linux keep `graphical-read-eval-print-loop` stuff?
It worked fine on Windows.

$ mred
path->complete-path: second argument is not a complete path: "./"

 === context ===
loop
find-library-collection-paths

exception raised by exception handler: standard-module-name-resolver: collection not found: "mzlib" in any of: (); original exception raised: path->complete-path: second argument is not a complete path: "./"
reference to undefined identifier: graphical-read-eval-print-loop

>>25
Except it didn't. In DOS like in Windows, a program can install itself wherever it wants. It doesn't work, unless what you want is a messy (yes, even messier than Unix's /*, /usr/*, /usr/local/*, /usr/local/local/local/*) filesystem.