Description of Problem:
A file /usr/share/umb-scheme/prelude.scheme says, among other things,
; MAINTENANCE PROCEDURES
; (vi) -- edit this file
Ok, lets try:
sh: line 1: /usr/ucb/vi: No such file or directory
Error: Edit on prelude.scheme didn't succeed; not reloading file.
Oops! The same, of course, will happen if you will attempt
==> (edit "some.other.file")
This can be worked around if you will set EDITOR in environment but
defaults should be sane.
The same applies to releases in earlier distributions.
Fixed in latest umb-scheme in rawhide.
Read ya, Phil