How can I update or upgrade BOSS Linux by terminal?

I use _EduBOSS Linux 3.0._ Since installation I still not update my OS. But I want to solve some Audio, Video and Graphics problems. To solve that problems I want update my BOSS Linux.
**sudo apt-get update** Hit http://packages.bosslinux.in anokha Release.gpg Hit http://packages.bosslinux.in eduboss-3.0 Release.gpg Hit http://packages.bosslinux.in anokha Release Hit http://packages.bosslinux.in eduboss-3.0 Release Hit http://packages.bosslinux.in anokha/main Sources Hit http://packages.bosslinux.in anokha/contrib Sources Ign http://ppa.launchpad.net anokha Release.gpg Hit http://packages.bosslinux.in anokha/non-free Sources Hit http://packages.bosslinux.in anokha/main i386 Packages Hit http://packages.bosslinux.in anokha/contrib i386 Packages Hit http://packages.bosslinux.in anokha/non-free i386 Packages Ign http://ppa.launchpad.net anokha Release Hit http://packages.bosslinux.in eduboss-3.0/main Sources Hit http://packages.bosslinux.in eduboss-3.0/main i386 Packages Ign http://packages.bosslinux.in anokha/contrib Translation-sa_IN Ign http://packages.bosslinux.in anokha/contrib Translation-sa Ign http://packages.bosslinux.in anokha/contrib Translation-en Ign http://packages.bosslinux.in anokha/main Translation-sa_IN Ign http://packages.bosslinux.in anokha/main Translation-sa Ign http://packages.bosslinux.in anokha/main Translation-en Ign http://packages.bosslinux.in anokha/non-free Translation-sa_IN Ign http://packages.bosslinux.in anokha/non-free Translation-sa Ign http://packages.bosslinux.in anokha/non-free Translation-en Ign http://packages.bosslinux.in eduboss-3.0/main Translation-sa_IN Ign http://packages.bosslinux.in eduboss-3.0/main Translation-sa Ign http://packages.bosslinux.in eduboss-3.0/main Translation-en Err http://ppa.launchpad.net anokha/main Sources 404 Not Found Hit http://dl.google.com stable Release.gpg Hit http://dl.google.com stable Release Err http://ppa.launchpad.net anokha/main i386 Packages 404 Not Found Hit http://dl.google.com stable/main i386 Packages Ign http://ppa.launchpad.net anokha/main Translation-sa_IN Ign http://ppa.launchpad.net anokha/main Translation-sa Ign http://ppa.launchpad.net anokha/main Translation-en Ign http://dl.google.com stable/main Translation-sa_IN Ign http://dl.google.com stable/main Translation-sa Ign http://dl.google.com stable/main Translation-en W: Failed to fetch http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu/dists/anokha/main/source/Sources 404 Not Found W: Failed to fetch http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu/dists/anokha/main/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. **How can I update BOSS Linux by terminal only?**