Quote Originally Posted by Ramaistro View Post
About the package installation what server and how to change it?
Click through (in English) System > Administration > Software Sources >enter your password > click the tab "Ubuntu Software" then in the middle of the window there is a menu titled "Download from:" followed by the name of the current server. Click that and you will be able to choose either your current server or the Main Server. Pick the other one and then let it reload the package lists.