Unable to download software center from package manager: 404 Not Found
Solution 1:
The packages have been updated in the repository.
I would recommend you run an update to refresh your "indexes" before retrying the installation i.e.
sudo apt-get update && sudo apt-get upgrade
Solution 2:
I had the same error a week ago and i fixed it. Follow the screenshots. Sorry its all german but I think (and hope) you will find the correct places.