Drupal 8

I've been running into problems with composer several times now in combination with Drupal 8 projects. This blog post shares my problem solving solutions. "Can only install one of ..." when updating In many cases this can be resolved by

You're referencing a Drupal 8 block via block reference but after saving the entity reference input field says "restricted access" (German: "Eingeschränkter Zugriff")? That's simple to solve... and "works as designed".