I am trying to install "ia32-libs" After doing google I did following steps. Yet not able to do it... 1st step i have added dpkg --add-architecture i386 2nd step added "deb http://archive.ubuntu.com/ubuntu/ raring main restricted universe multiverse" ia32-libs-raring.list" root@user:/etc/apt/sources.list.d# sudo dpkg --add-architecture i386 root@user:/etc/apt/sources.list.d# echo "deb http://archive.ubuntu.com/ubuntu/ raring main restricted universe multiverse" >ia32-libs-raring.list root@user:/etc/apt/sources.list.d# apt-get update Ign http://us-east-1.ec2.archive.ubuntu.com trusty InRelease Ign http://security.ubuntu.com trusty-security InRelease Ign http://archive.ubuntu.com raring InRelease Ign http://us-east-1.ec2.archive.ubuntu.com trusty-updates InRelease Hit http://security.ubuntu.com trusty-security Release.gpg Ign http://archive.ubuntu.com raring Release.gpg Hit http://us-east-1.ec2.archive.ubuntu.com trusty Release.gpg Hit http://security.ubuntu.com trusty-security Release Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates Release.gpg Ign http://archive.ubuntu.com raring Release Hit http://us-east-1.ec2.archive.ubuntu.com trusty Release Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates Release Hit http://security.ubuntu.com trusty-security/main Sources Hit http://us-east-1.ec2.archive.ubuntu.com trusty/main Sources Hit http://security.ubuntu.com trusty-security/universe Sources Hit http://us-east-1.ec2.archive.ubuntu.com trusty/universe Sources Hit http://security.ubuntu.com trusty-security/main amd64 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty/main amd64 Packages Hit http://security.ubuntu.com trusty-security/universe amd64 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty/universe amd64 Packages Hit http://security.ubuntu.com trusty-security/main i386 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty/main i386 Packages Hit http://security.ubuntu.com trusty-security/universe i386 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty/universe i386 Packages Hit http://security.ubuntu.com trusty-security/main Translation-en Hit http://security.ubuntu.com trusty-security/universe Translation-en Hit http://us-east-1.ec2.archive.ubuntu.com trusty/main Translation-en Hit http://us-east-1.ec2.archive.ubuntu.com trusty/universe Translation-en Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/main Sources Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/universe Sources Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/main amd64 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/universe amd64 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/main i386 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/universe i386 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/main Translation-en Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/universe Translation-en Ign http://us-east-1.ec2.archive.ubuntu.com trusty/main Translation-en_US Ign http://us-east-1.ec2.archive.ubuntu.com trusty/universe Translation-en_US Err http://archive.ubuntu.com raring/main amd64 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/restricted amd64 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/universe amd64 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/multiverse amd64 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/main i386 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/restricted i386 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/universe i386 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/multiverse i386 Packages 404 Not Found [IP: 91.189.91.13 80] Ign http://archive.ubuntu.com raring/main Translation-en_US Ign http://archive.ubuntu.com raring/main Translation-en Ign http://archive.ubuntu.com raring/multiverse Translation-en_US Ign http://archive.ubuntu.com raring/multiverse Translation-en Ign http://archive.ubuntu.com raring/restricted Translation-en_US Ign http://archive.ubuntu.com raring/restricted Translation-en Ign http://archive.ubuntu.com raring/universe Translation-en_US Ign http://archive.ubuntu.com raring/universe Translation-en W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/main/binary-amd64/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/restricted/binary-amd64/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/universe/binary-amd64/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/multiverse/binary-amd64/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/main/binary-i386/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/universe/binary-i386/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.91.13 80] E: Some index files failed to download. They have been ignored, or old ones used instead.