The Linux Mint Repositories are Closed on September 18

All Linux Mint users are urged to remain calm during this maintenance. If you use Linux Mint 15 (Olivia) and you want to install or update some packages, go to Menu – Preferences – Software Sources, click the “Main (Olivia)” button from the “Mirrors” sub-section of the “Official repositories” section and wait a couple of minutes for the app to find another mirror.