سلام دوستان الان 2 هفتست موقع آپدیت به این ارور برمیخورم. ممکنه راهنماییم کنید دقیقا باید چیکار کنم؟
Failed to fetch cdrom://Ubuntu 12.10 _Quantal Quetzal_ - Release amd64 (20121017.5)/dists/quantal/main/binary-amd64/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Failed to fetch cdrom://Ubuntu 12.10 _Quantal Quetzal_ - Release amd64 (20121017.5)/dists/quantal/restricted/binary-amd64/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Failed to fetch cdrom://Ubuntu 12.10 _Quantal Quetzal_ - Release amd64 (20121017.5)/dists/quantal/main/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Failed to fetch cdrom://Ubuntu 12.10 _Quantal Quetzal_ - Release amd64 (20121017.5)/dists/quantal/restricted/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Failed to fetch http://ppa.launchpad.net/joe-nationnet/ppa/ubuntu/dists/quantal/main/source/Sources 404 Not Found
Failed to fetch http://ppa.launchpad.net/joe-nationnet/ppa/ubuntu/dists/quantal/main/binary-amd64/Packages 404 Not Found
Failed to fetch http://ppa.launchpad.net/joe-nationnet/ppa/ubuntu/dists/quantal/main/binary-i386/Packages 404 Not Found
Some index files failed to download. They have been ignored, or old ones used instead.