When I type in 'sudo apt-get update' I get this >>

mohd-arafat-hossain@TUD:~$ sudo apt-get update
[sudo] password for mohd-arafat-hossain:
Ign http://bd.archive.ubuntu.com precise InRelease
Ign http://bd.archive.ubuntu.com precise-updates InRelease                     
Ign http://bd.archive.ubuntu.com precise-backports InRelease                   
Ign http://bd.archive.ubuntu.com precise Release.gpg                           
Ign http://bd.archive.ubuntu.com precise-updates Release.gpg                   
Ign http://bd.archive.ubuntu.com precise-backports Release.gpg                 
Ign http://bd.archive.ubuntu.com precise Release                               
Ign http://bd.archive.ubuntu.com precise-updates Release                       
Ign http://bd.archive.ubuntu.com precise-backports Release                     
Ign http://extras.ubuntu.com precise InRelease                                 
Ign http://ppa.launchpad.net precise InRelease                                 
Hit http://extras.ubuntu.com precise Release.gpg                     
Hit http://ppa.launchpad.net precise Release.gpg                     
Hit http://extras.ubuntu.com precise Release                         
Hit http://ppa.launchpad.net precise Release                                   
Hit http://extras.ubuntu.com precise/main Sources                              
Hit http://bd.archive.ubuntu.com precise/main TranslationIndex                 
Hit http://ppa.launchpad.net precise/main Sources                              
Hit http://bd.archive.ubuntu.com precise/multiverse TranslationIndex           
Hit http://bd.archive.ubuntu.com precise/restricted TranslationIndex           
Hit http://extras.ubuntu.com precise/main i386 Packages              
Ign http://extras.ubuntu.com precise/main TranslationIndex                     
Hit http://bd.archive.ubuntu.com precise/universe TranslationIndex             
Hit http://ppa.launchpad.net precise/main i386 Packages                        
Ign http://ppa.launchpad.net precise/main TranslationIndex                     
Ign http://security.ubuntu.com precise-security InRelease                      
Hit http://security.ubuntu.com precise-security Release.gpg                    
Hit http://bd.archive.ubuntu.com precise-updates/main TranslationIndex         
Hit http://security.ubuntu.com precise-security Release                        
Hit http://bd.archive.ubuntu.com precise-updates/multiverse TranslationIndex   
Hit http://bd.archive.ubuntu.com precise-updates/restricted TranslationIndex   
Hit http://bd.archive.ubuntu.com precise-updates/universe TranslationIndex
Hit http://security.ubuntu.com precise-security/main Sources         
Ign http://extras.ubuntu.com precise/main Translation-en_US                    
Ign http://ppa.launchpad.net precise/main Translation-en_US                    
Ign http://extras.ubuntu.com precise/main Translation-en             
Hit http://bd.archive.ubuntu.com precise-backports/main TranslationIndex
Hit http://bd.archive.ubuntu.com precise-backports/multiverse TranslationIndex
Hit http://bd.archive.ubuntu.com precise-backports/restricted TranslationIndex
Ign http://ppa.launchpad.net precise/main Translation-en
Hit http://bd.archive.ubuntu.com precise-backports/universe TranslationIndex   
Hit http://bd.archive.ubuntu.com precise/main Translation-en                   
Hit http://bd.archive.ubuntu.com precise/multiverse Translation-en             
Hit http://bd.archive.ubuntu.com precise/restricted Translation-en
Hit http://bd.archive.ubuntu.com precise/universe Translation-en
Hit http://security.ubuntu.com precise-security/restricted Sources             
Hit http://security.ubuntu.com precise-security/universe Sources               
Hit http://security.ubuntu.com precise-security/multiverse Sources             
Hit http://security.ubuntu.com precise-security/main i386 Packages             
Hit http://security.ubuntu.com precise-security/restricted i386 Packages
Hit http://bd.archive.ubuntu.com precise-updates/main Translation-en           
Hit http://bd.archive.ubuntu.com precise-updates/multiverse Translation-en     
Hit http://security.ubuntu.com precise-security/universe i386 Packages
Hit http://security.ubuntu.com precise-security/multiverse i386 Packages
Hit http://security.ubuntu.com precise-security/main TranslationIndex
Hit http://security.ubuntu.com precise-security/multiverse TranslationIndex    
Hit http://security.ubuntu.com precise-security/restricted TranslationIndex    
Hit http://security.ubuntu.com precise-security/universe TranslationIndex      
Hit http://bd.archive.ubuntu.com precise-updates/restricted Translation-en     
Hit http://bd.archive.ubuntu.com precise-updates/universe Translation-en       
Hit http://security.ubuntu.com precise-security/main Translation-en
Hit http://security.ubuntu.com precise-security/multiverse Translation-en      
Hit http://security.ubuntu.com precise-security/restricted Translation-en      
Hit http://security.ubuntu.com precise-security/universe Translation-en        
Hit http://bd.archive.ubuntu.com precise-backports/main Translation-en         
Hit http://bd.archive.ubuntu.com precise-backports/multiverse Translation-en
Hit http://bd.archive.ubuntu.com precise-backports/restricted Translation-en
Hit http://bd.archive.ubuntu.com precise-backports/universe Translation-en
Err http://bd.archive.ubuntu.com precise/main Sources     
  404  Not Found
Err http://bd.archive.ubuntu.com precise/restricted Sources
  404  Not Found
Err http://bd.archive.ubuntu.com precise/universe Sources
  404  Not Found
Err http://bd.archive.ubuntu.com precise/multiverse Sources
  404  Not Found
Err http://bd.archive.ubuntu.com precise/main i386 Packages
  404  Not Found
Err http://bd.archive.ubuntu.com precise/restricted i386 Packages
  404  Not Found
Err http://bd.archive.ubuntu.com precise/universe i386 Packages
  404  Not Found
Err http://bd.archive.ubuntu.com precise/multiverse i386 Packages
  404  Not Found
Err http://bd.archive.ubuntu.com precise-updates/main Sources
  404  Not Found
Err http://bd.archive.ubuntu.com precise-updates/restricted Sources
  404  Not Found
Err http://bd.archive.ubuntu.com precise-updates/universe Sources
  404  Not Found
Err http://bd.archive.ubuntu.com precise-updates/multiverse Sources
  404  Not Found
Err http://bd.archive.ubuntu.com precise-updates/main i386 Packages
  404  Not Found
Err http://bd.archive.ubuntu.com precise-updates/restricted i386 Packages
  404  Not Found
Err http://bd.archive.ubuntu.com precise-updates/universe i386 Packages
  404  Not Found
Err http://bd.archive.ubuntu.com precise-updates/multiverse i386 Packages
  404  Not Found
Err http://bd.archive.ubuntu.com precise-backports/main Sources
  404  Not Found
Err http://bd.archive.ubuntu.com precise-backports/restricted Sources
  404  Not Found
Err http://bd.archive.ubuntu.com precise-backports/universe Sources
  404  Not Found
Err http://bd.archive.ubuntu.com precise-backports/multiverse Sources
  404  Not Found
Err http://bd.archive.ubuntu.com precise-backports/main i386 Packages
  404  Not Found
Err http://bd.archive.ubuntu.com precise-backports/restricted i386 Packages
  404  Not Found
Err http://bd.archive.ubuntu.com precise-backports/universe i386 Packages
  404  Not Found
Err http://bd.archive.ubuntu.com precise-backports/multiverse i386 Packages
  404  Not Found
W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/main/source/Sources  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/restricted/source/Sources  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/universe/source/Sources  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/multiverse/source/Sources  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/main/binary-i386/Packages  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/restricted/binary-i386/Packages  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/universe/binary-i386/Packages  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise/multiverse/binary-i386/Packages  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/main/source/Sources  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/restricted/source/Sources  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/universe/source/Sources  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/multiverse/source/Sources  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/main/binary-i386/Packages  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/restricted/binary-i386/Packages  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/universe/binary-i386/Packages  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-updates/multiverse/binary-i386/Packages  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/main/source/Sources  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/restricted/source/Sources  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/source/Sources  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/multiverse/source/Sources  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/main/binary-i386/Packages  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/restricted/binary-i386/Packages  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/universe/binary-i386/Packages  404  Not Found

W: Failed to fetch http://bd.archive.ubuntu.com/ubuntu/dists/precise-backports/multiverse/binary-i386/Packages  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

How do solve this issue and not get this error. Please