          (upgrade-count (length update-packages))
          (upgraded-count 0)
          (update-packages-alist))
+    (when configuration-layer--skipped-packages
+      (spacemacs-buffer/append
+       (format (concat "--> Warning: cannot update %s package(s), possibly due"
+                       " to a temporary network problem: %s\n")
+               skipped-count
+               (mapconcat #'symbol-name
+                          configuration-layer--skipped-packages
+                          " "))))
     ;; (message "packages to udpate: %s" update-packages)
     (if (> upgrade-count 0)
         (if (and (not always-update)
                  (not (yes-or-no-p (format (concat "%s package(s) to update, "
+                                                   (if (> skipped-count 0)
+                                                       (format "%s package(s) skipped, "
+                                                               skipped-count)
+                                                     "")
                                                    "do you want to continue ? ")
                                            upgrade-count))))
             (spacemacs-buffer/append

   "--> fetching new package repository indexes...\n")
  (spacemacs//redisplay)
  (package-refresh-contents)
  (let* ((update-packages
          (configuration-layer//get-packages-to-update
           (mapcar 'car (object-assoc-list
                         :name configuration-layer--used-distant-packages))))
         (date (format-time-string "%y-%m-%d_%H.%M.%S"))
         (rollback-dir (expand-file-name
                        (concat configuration-layer-rollback-directory

              (configuration-layer//get-latest-package-version-string
               pkg-name)))
      ;; (message "%s: %s > %s ?" pkg-name cur-version new-version)
      (if new-version
          (version< cur-version new-version)
        (cl-pushnew pkg-name configuration-layer--skipped-packages :test #'eq)
        nil))))

(defun configuration-layer//get-packages-to-update (pkg-names)
  "Return a filtered list of PKG-NAMES to update."
