ejemplo

Checksum error An error occurred while updating the package checksum.

pkg: Git checkout initial protocol failed;
 the given URL might not refer to a Git repository
  given URL: https://github.com/.git
  context...:
   /home/pkgserver/racket/collects/pkg/private/stage.rkt:782:25
   /home/pkgserver/racket/collects/net/git-checkout.rkt:382:0: parse-initial-refs
   /home/pkgserver/racket/collects/net/git-checkout.rkt:74:8
   /home/pkgserver/racket/collects/net/git-checkout.rkt:55:2: retry-loop
   /home/pkgserver/pkg-index/official/update.rkt:31:2
   /home/pkgserver/racket/collects/racket/private/list.rkt:263:2: filter
   /home/pkgserver/pkg-index/official/update.rkt:174:0: do-update!
   /home/pkgserver/pkg-index/official/common.rkt:148:0: run!
   /home/pkgserver/pkg-index/official/update.rkt:185:0: run-update!