how could I obtain more context to isolate the problem?

[Don Green]

$ raco setup ?
collection-path: collection not found
  collection: "t"
  in collection directories:
   /home/don/.plt-scheme/4.2.1/collects
   /home/don/.racket/8.1/collects
   /home/don/racket/collects/

   ... [175 additional linked and package directories]

Thanks

[D. Ben Knoble]

Are you passing the `?` to `raco setup`? If so, I suspect your shell is expanding that to a file or directory named `t` (which matches the glob `?`), which is then used as a collection name.