The installation stopped after download in my case and pressing enter solved the problem. This was not the confirmation for experimental packages (where the terminal tells you to do something). It looked pretty much like the above screen shots.
I figured it's a bug, but as I said, never gave it any thought, as it didn't bother me. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/e10c135f-4ade-4756-9a73-a7711ecff84e%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.